{"id":3317,"date":"2021-07-23T08:43:25","date_gmt":"2021-07-23T03:13:25","guid":{"rendered":"http:\/\/mcq-questions.com\/?p=3317"},"modified":"2022-03-02T10:25:56","modified_gmt":"2022-03-02T04:55:56","slug":"ncert-solutions-for-class-9-maths-chapter-13-hindi","status":"publish","type":"post","link":"https:\/\/mcq-questions.com\/ncert-solutions-for-class-9-maths-chapter-13-hindi\/","title":{"rendered":"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium)"},"content":{"rendered":"<h2><span style=\"color: #00ccff;\">NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium)<\/span><\/h2>\n<p>These Solutions are part of <a href=\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-9-maths\/\">NCERT Solutions for Class 9 Maths in Hindi Medium<\/a>. Here we have given NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes.<\/p>\n<p style=\"text-align: center;\"><span style=\"color: #0000ff;\"><strong>\u092a\u094d\u0930\u0936\u094d\u0928\u093e\u0935\u0932\u0940 13.1<\/strong><\/span><\/p>\n<p><strong>Ex 13.1 Class 9 \u0917\u0923\u093f\u0924 \u092a\u094d\u0930\u0936\u094d\u0928 1.<\/strong><br \/>\n1.5 \u092e\u0940\u091f\u0930 \u0932\u092e\u094d\u092c\u093e, 1.25 \u092e\u0940\u091f\u0930 \u091a\u094c\u0921\u093c\u093e \u0914\u0930 65 \u0938\u0947\u092e\u0940 \u0917\u0939\u0930\u093e \u092a\u094d\u0932\u093e\u0938\u094d\u091f\u093f\u0915 \u0915\u093e \u090f\u0915 \u0921\u093f\u092c\u094d\u092c\u093e \u092c\u0928\u093e\u092f\u093e \u091c\u093e\u0928\u093e \u0939\u0948\u0964 \u0907\u0938\u0947 \u090a\u092a\u0930 \u0938\u0947 \u0916\u0941\u0932\u093e \u0930\u0916\u0928\u093e \u0939\u0948\u0964 \u092a\u094d\u0932\u093e\u0938\u094d\u091f\u093f\u0915 \u0936\u0940\u091f \u0915\u0940 \u092e\u094b\u091f\u093e\u0908 \u0915\u094b \u0928\u0917\u0923\u094d\u092f \u092e\u093e\u0928\u0924\u0947 \u0939\u0941\u090f \u0928\u093f\u0930\u094d\u0927\u093e\u0930\u093f\u0924 \u0915\u0940\u091c\u093f\u090f :<br \/>\n(i) \u0921\u093f\u092c\u094d\u092c\u093e \u092c\u0928\u093e\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u0906\u0935\u0936\u094d\u092f\u0915 \u092a\u094d\u0932\u093e\u0938\u094d\u091f\u093f\u0915 \u0936\u0940\u091f \u0915\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932\u0964<br \/>\n(ii) \u0907\u0938 \u0936\u0940\u091f \u0915\u093e \u092e\u0942\u0932\u094d\u092f, \u092f\u0926\u093f 1 \u092e\u0940\u091f\u0930 \u0936\u0940\u091f \u0915\u093e \u092e\u0942\u0932\u094d\u092f 20 \u0939\u0948\u0964<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n(i) \u0926\u093f\u092f\u093e \u0939\u0948, \u092a\u094d\u0932\u093e\u0938\u094d\u091f\u093f\u0915 \u0915\u0947 \u0921\u093f\u092c\u094d\u092c\u0947 \u0915\u0940 \u0932\u092e\u094d\u092c\u093e\u0908 (l) = 1.5 \u092e\u0940\u091f\u0930,<br \/>\n\u091a\u094c\u0921\u093c\u093e\u0908 (b) = 1.25 \u092e\u0940\u091f\u0930 \u0924\u0925\u093e<br \/>\n\u090a\u0901\u091a\u093e\u0908 (h) = 65 \u0938\u0947\u092e\u0940 \u092f\u093e 0.65 \u092e\u0940\u091f\u0930<br \/>\n\u0921\u093f\u092c\u094d\u092c\u093e \u090a\u092a\u0930\u0947 \u0938\u0947 \u0916\u0941\u0932\u093e \u0939\u0948; \u0905\u0924: \u0907\u0938\u092e\u0947\u0902 1 \u092b\u0932\u0915 \u0915\u092e \u0939\u094b\u0917\u093e\u0964<br \/>\n\u0905\u0924\u0903 \u0921\u093f\u092c\u094d\u092c\u0947 \u0915\u093e \u092a\u0943\u0937\u094d\u0920 = \u0938\u092e\u094d\u092a\u0942\u0930\u094d\u0923 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 &#8211; \u090a\u092a\u0930\u0940 \u092b\u0932\u0915 \u0915\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932<br \/>\n= 2 (lb + bh + hl) &#8211; (l x b)<br \/>\n= 2 [(1.5 x 1.25) + (1.25 x 0.65) + (0.65 x 1.5)] &#8211; (1.5 x 1.25)<br \/>\n= 2 [1.875 + 0.8125 + 0.975] &#8211; 1.875<br \/>\n= 2 [3.6625] &#8211; 1.875<br \/>\n= 7.325 &#8211; 1.875<br \/>\n= 5.45 \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930<br \/>\n\u0905\u0924: \u0921\u093f\u092c\u094d\u092c\u093e \u092c\u0928\u093e\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u0906\u0935\u0936\u094d\u092f\u0915 \u092a\u094d\u0932\u093e\u0938\u094d\u091f\u093f\u0915 \u0936\u0940\u091f \u0915\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 5.45 \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930\u0964<br \/>\n(ii), \u092a\u094d\u0932\u093e\u0938\u094d\u091f\u093f\u0915 \u0936\u0940\u091f \u0915\u093e \u092e\u0942\u0932\u094d\u092f = \u0936\u0940\u091f \u0915\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 x \u092e\u0942\u0932\u094d\u092f-\u0926\u0930 = (5.45 x 20) = 109.00<br \/>\n\u0905\u0924\u0903 \u0906\u0935\u0936\u094d\u092f\u0915 \u092a\u094d\u0932\u093e\u0938\u094d\u091f\u093f\u0915 \u0936\u0940\u091f \u0915\u093e \u092e\u0942\u0932\u094d\u092f = 109<\/p>\n<p><strong>Ex 13.1 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 2.<\/strong><br \/>\n\u090f\u0915 \u0915\u092e\u0930\u0947 \u0915\u0940 \u0932\u092e\u094d\u092c\u093e\u0908, \u091a\u094c\u0921\u093c\u093e\u0908 \u0914\u0930 \u090a\u0901\u091a\u093e\u0908 \u0915\u094d\u0930\u092e\u0936\u0903 5 \u092e\u0940\u091f\u0930, 4 \u092e\u0940\u091f\u0930 \u0914\u0930 3 \u092e\u0940\u091f\u0930 \u0939\u0948\u0902\u0964 \u20b9 7.50 \u092a\u094d\u0930\u0924\u093f \u092e\u0940\u091f\u0930 \u0915\u0940 \u0926\u0930 \u0938\u0947 \u0907\u0938 \u0915\u092e\u0930\u0947 \u0915\u0940 \u0926\u0940\u0935\u093e\u0930\u094b\u0902 \u0914\u0930 \u091b\u0924 \u092a\u0930 \u0938\u092b\u0947\u0926\u0940 \u0915\u0930\u093e\u0928\u0947 \u0915\u093e \u0935\u094d\u092f\u092f \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u0926\u093f\u092f\u093e \u0939\u0948, \u0915\u092e\u0930\u0947 \u0915\u0940 \u0932\u092e\u094d\u092c\u093e\u0908 (l) = 5 \u092e\u0940\u091f\u0930, \u091a\u094c\u0921\u093c\u093e\u0908 (b) = 4 \u092e\u0940\u091f\u0930 \u0935 \u090a\u0901\u091a\u093e\u0908 (h) = 3 \u092e\u0940\u091f\u0930<br \/>\n\u0915\u092e\u0930\u0947 \u0915\u0940 \u091a\u093e\u0930\u094b\u0902 \u0926\u0940\u0935\u093e\u0930\u094b\u0902 \u0915\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = \u092a\u0930\u093f\u092e\u093e\u092a x \u090a\u0901\u091a\u093e\u0908\u0964<br \/>\n= 2 (l + b) x h = 2 (5 + 4) x 3 = 18 x 3 = 54 \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930<br \/>\n\u091b\u0924 \u0915\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = \u0932\u092e\u094d\u092c\u093e\u0908 x \u091a\u094c\u0921\u093c\u093e\u0908<br \/>\n= (5 x 4) = 20 \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930<br \/>\n\u091c\u093f\u0938 \u092d\u093e\u0917 \u092e\u0947\u0902 \u0938\u092b\u0947\u0926\u0940 \u0915\u0930\u093e\u0928\u0940 \u0939\u0948, \u0909\u0938\u0915\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = (54 + 20) \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930 = 74 \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930<br \/>\n\u0915\u092e\u0930\u0947 \u092e\u0947\u0902 \u0938\u092b\u0947\u0926\u0940 \u0915\u0930\u093e\u0928\u0947 \u0915\u093e \u0935\u094d\u092f\u092f = \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 x \u092e\u0942\u0932\u094d\u092f-\u0926\u0930 = 74 x 7.50 = 555<br \/>\n\u0905\u0924\u0903 \u0915\u092e\u0930\u0947 \u092e\u0947\u0902 \u0938\u092b\u0947\u0926\u0940 \u0915\u0930\u093e\u0928\u0947 \u0915\u093e \u0935\u094d\u092f\u092f = 555<\/p>\n<p><strong>Ex 13.1 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 3.<\/strong><br \/>\n\u0915\u093f\u0938\u0940 \u0906\u092f\u0924\u093e\u0915\u093e\u0930 \u0939\u0949\u0932 \u0915\u0947 \u092b\u0930\u094d\u0936 \u0915\u093e \u092a\u0930\u093f\u092e\u093e\u092a 250 \u092e\u0940\u091f\u0930 \u0939\u0948\u0964 \u092f\u0926\u093f 10 \u092a\u094d\u0930\u0924\u093f \u092e\u0940\u091f\u0930 \u0915\u0940 \u0926\u0930 \u0938\u0947 \u091a\u093e\u0930\u094b\u0902 \u0926\u0940\u0935\u093e\u0930\u094b\u0902 \u092a\u0930 \u092a\u0947\u0902\u091f \u0915\u0930\u093e\u0928\u0947 \u0915\u0940 \u0932\u093e\u0917\u0924 15,000 \u0939\u0948, \u0924\u094b \u0907\u0938 \u0939\u0949\u0932 \u0915\u0940 \u090a\u0901\u091a\u093e\u0908 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964 [\u0938\u0902\u0915\u0947\u0924\u0903 \u091a\u093e\u0930\u094b\u0902 \u0921\u093f\u092c\u094d\u092c\u094b\u0902 \u0915\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = \u092a\u093e\u0930\u094d\u0936\u094d\u0935 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932]<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u092e\u093e\u0928\u093e \u0939\u0949\u0932 \u0915\u0940 \u090a\u0901\u091a\u093e\u0908 h \u092e\u0940\u091f\u0930 \u0939\u0948\u0964<br \/>\n\u0926\u093f\u092f\u093e \u0939\u0948, \u0939\u0949\u0932 \u0915\u093e \u092a\u0930\u093f\u092e\u093e\u092a = 250 \u092e\u0940\u091f\u0930<br \/>\n\u0939\u0949\u0932 \u0915\u0940 \u091a\u093e\u0930\u094b\u0902 \u0926\u0940\u0935\u093e\u0930\u094b\u0902 \u0915\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = \u0939\u0949\u0932 \u0915\u093e \u092a\u0930\u093f\u092e\u093e\u092a x \u090a\u0901\u091a\u093e\u0908 = 250 x h = 250h \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930<br \/>\n\u0924\u092c \u0939\u0949\u0932 \u0915\u0940 \u0926\u0940\u0935\u093e\u0930\u094b\u0902 \u092a\u0930 \u092a\u0947\u0902\u091f \u0915\u0930\u093e\u0928\u0947 \u0915\u093e \u0935\u094d\u092f\u092f = \u0939\u0949\u0932 \u0915\u0940 \u0926\u0940\u0935\u093e\u0930\u094b\u0902 \u0915\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 x \u092a\u0947\u0902\u091f \u0915\u0930\u093e\u0928\u0947 \u0915\u0940 \u092e\u0942\u0932\u094d\u092f-\u0926\u0930<br \/>\n= 250 h x 10 = 2,500 h<br \/>\n\u092a\u094d\u0930\u0936\u094d\u0928\u093e\u0928\u0941\u0938\u093e\u0930, \u092a\u0947\u0902\u091f \u0915\u0930\u093e\u0928\u0947 \u0915\u093e \u0935\u094d\u092f\u092f = 15,000<br \/>\n2,500 h = 15,000<br \/>\nh = \\(\\frac { 15000 }{ 2500 }\\) = 6 \u092e\u0940\u091f\u0930<br \/>\n\u0905\u0924: \u0939\u0949\u0932 \u0915\u0940 \u090a\u0901\u091a\u093e\u0908 = 6 \u092e\u0940\u091f\u0930<\/p>\n<p><strong>Ex 13.1 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 4.<\/strong><br \/>\n\u0915\u093f\u0938\u0940 \u0921\u093f\u092c\u094d\u092c\u0947 \u092e\u0947\u0902 \u092d\u0930\u093e \u0939\u0941\u0906 \u092a\u0947\u0902\u091f 9.375 \u092e\u0940\u091f\u0930 \u0915\u0947 \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 \u092a\u0930 \u092a\u0947\u0902\u091f \u0915\u0930\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u092a\u0930\u094d\u092f\u093e\u092a\u094d\u0924 \u0939\u0948\u0964 \u0907\u0938 \u0921\u093f\u092c\u094d\u092c\u0947 \u0915\u0947 \u092a\u0947\u0902\u091f \u0938\u0947 22.5 \u0938\u0947\u092e\u0940 x 10 \u0938\u0947\u092e\u0940 x 7.5 \u0938\u0947\u092e\u0940 \u0935\u093f\u092e\u093e\u0913\u0902 \u0935\u093e\u0932\u0940 \u0915\u093f\u0924\u0928\u0940 \u0908\u0902\u091f \u092a\u0947\u0902\u091f \u0915\u0940 \u091c\u093e \u0938\u0915\u0924\u0940 \u0939\u0948\u0902?<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u0926\u093f\u092f\u093e \u0939\u0948, \u0908\u0902\u091f \u0915\u0940 \u0935\u093f\u092e\u093e\u090f\u0901 22.5 \u0938\u0947\u092e\u0940 x 10 \u0938\u0947\u092e\u0940 x 7.5 \u0938\u0947\u092e\u0940 \u0939\u0948\u0902\u0964<br \/>\nl = 22.5 \u0938\u0947\u092e\u0940, b = 10 \u0938\u0947\u092e\u0940 \u0914\u0930 h = 7.5 \u0938\u0947\u092e\u0940<br \/>\n\u092a\u094d\u0930\u0924\u094d\u092f\u0947\u0915 \u0908\u0902\u091f \u0915\u093e \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 2 [lb + bh + hl]<br \/>\n= 2 [(22.5 x 10) + (10 x 7.5) + (7.5 x 22.5)]<br \/>\n=2 [2250 + 750 + 168.75]<br \/>\n= 2 x 468.75<br \/>\n= 937.5 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n\u092e\u093e\u0928\u093e \u0915\u093f \u0908\u0902\u091f\u094b\u0902 \u0915\u0940 \u0905\u092d\u0940\u0937\u094d\u091f \u0938\u0902\u0916\u094d\u092f\u093e n \u0939\u0948\u0964<br \/>\n\u0915\u0941\u0932 \u0908\u0902\u091f\u094b\u0902 \u0915\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 937.5 n \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940\u0964<br \/>\n\u092a\u0930\u0928\u094d\u0924\u0941 \u092a\u094d\u0930\u0936\u094d\u0928 \u092e\u0947\u0902 \u0926\u093f\u092f\u093e \u0917\u092f\u093e \u0939\u0948 \u0915\u093f \u092a\u0947\u0902\u091f 9375 \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930 \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 \u092a\u0930 \u092a\u0947\u0902\u091f \u0915\u0930\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u092a\u0930\u094d\u092f\u093e\u092a\u094d\u0924 \u0939\u0948\u0964<br \/>\n937.5 n \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940 = 9.375 \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930<br \/>\n937.5 n \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940 = 9.375 x 10,000 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940 (1 \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930 = 10,000 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940)<br \/>\n937.5 n = 93,750<br \/>\nn = \\(\\frac { 93750 }{ 937.5 }\\) = 100<br \/>\n\u0905\u0924\u0903 \u0908\u0902\u091f\u094b\u0902 \u0915\u0940 \u0905\u092d\u0940\u0937\u094d\u091f \u0938\u0902\u0916\u094d\u092f\u093e = 100<\/p>\n<p><strong>Ex 13.1 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 5.<\/strong><br \/>\n\u090f\u0915 \u0918\u0928\u093e\u0915\u093e\u0930 \u0921\u093f\u092c\u094d\u092c\u0947 \u0915\u093e \u090f\u0915 \u0915\u093f\u0928\u093e\u0930\u093e 10 \u0938\u0947\u092e\u0940 \u0932\u092e\u094d\u092c\u093e\u0908 \u0915\u093e \u0939\u0948 \u0924\u0925\u093e \u090f\u0915 \u0905\u0928\u094d\u092f \u0918\u0928\u093e\u092d\u093e\u0915\u093e\u0930 \u0921\u093f\u092c\u094d\u092c\u0947 \u0915\u0940 \u0932\u092e\u094d\u092c\u093e\u0908, \u091a\u094c\u0921\u093c\u093e\u0908 \u0914\u0930 \u090a\u0901\u091a\u093e\u0908 \u0915\u094d\u0930\u092e\u0936\u0903 12.5 \u0938\u0947\u092e\u0940, 10 \u0938\u0947\u092e\u0940 \u0914\u0930 8 \u0938\u0947\u092e\u0940 \u0939\u0948\u0902\u0964<br \/>\n(i) \u0915\u093f\u0938 \u0921\u093f\u092c\u094d\u092c\u0947 \u0915\u093e \u092a\u093e\u0936\u094d\u0930\u094d\u0935 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 \u0905\u0927\u093f\u0915 \u0939\u0948 \u0914\u0930 \u0915\u093f\u0924\u0928\u093e \u0905\u0927\u093f\u0915 \u0939\u0948?<br \/>\n(ii) \u0915\u093f\u0938 \u0921\u093f\u092c\u094d\u092c\u0947 \u0915\u093e \u0915\u0941\u0932 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 \u0915\u092e \u0939\u0948 \u0914\u0930 \u0915\u093f\u0924\u0928\u093e \u0915\u092e \u0939\u0948?<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n(i) \u0918\u0928\u093e\u0915\u093e\u0930 \u0921\u093f\u092c\u094d\u092c\u0947 \u0915\u094b \u092a\u093e\u0930\u094d\u0935-\u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 4 x \u092d\u0941\u091c\u093e\u00b2 = 4 x (10)\u00b2 = 400 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n\u0918\u0928\u093e\u092d\u093e\u0915\u093e\u0930 \u0921\u093f\u092c\u094d\u092c\u0947 \u0915\u093e \u092a\u093e\u0930\u094d\u0936\u094d\u0935 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = \u092a\u0930\u093f\u092e\u093e\u092a x \u090a\u0901\u091a\u093e\u0908 = 2 (\u0932\u092e\u094d\u092c\u093e\u0908 + \u091a\u094c\u0921\u093c\u093e\u0908) x \u090a\u0901\u091a\u093e\u0908<br \/>\n= 2 (12.5 + 10) x 8 = 16 x 22.5 = 3600 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n\u0905\u0924\u0903 \u0938\u094d\u092a\u0937\u094d\u091f \u0939\u0948 \u0915\u093f \u0918\u0928\u093e\u0915\u093e\u0930 \u0921\u093f\u092c\u094d\u092c\u0947 \u0915\u093e \u092a\u0943\u0937\u094d\u0920 (400 &#8211; 360) = 40 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940 \u0905\u0927\u093f\u0915 \u0939\u0948\u0964<br \/>\n(ii) \u0918\u0928\u093e\u0915\u0930 \u0921\u093f\u092c\u094d\u092c\u0947 \u0915\u093e \u0938\u092e\u094d\u092a\u0942\u0930\u094d\u0923 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 6 x \u092d\u0941\u091c\u093e\u00b2 = 6 x (10)\u00b2 = 600 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n\u0918\u0928\u093e\u092d\u093e\u0915\u093e\u0930 \u0921\u093f\u092c\u094d\u092c\u0947 \u0915\u093e \u0938\u092e\u094d\u092a\u0942\u0930\u094d\u0923 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 2 (lb + bh + hl)<br \/>\n=2 [ (12.5 x 10) + (10 x 8) + (8 x 12.5)]<br \/>\n= 2 [125 + 80 + 100]<br \/>\n= 2 x 305<br \/>\n= 610 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n\u0905\u0924\u0903 \u0938\u094d\u092a\u0937\u094d\u091f \u0939\u0948 \u0915\u093f \u0918\u0928\u093e\u0915\u093e\u0930 \u0921\u093f\u092c\u094d\u092c\u0947\u0915\u093e \u0915\u0941\u0932\u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 (610 &#8211; 600) = 10 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940 \u0915\u092e \u0939\u0948\u0964<\/p>\n<p><strong>Ex 13.1 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 6.<\/strong><br \/>\n\u090f\u0915 \u091b\u094b\u091f\u093e \u092a\u094c\u0927\u093e-\u0918\u0930 (green house) \u0938\u092e\u094d\u092a\u0942\u0930\u094d\u0923 \u0930\u0942\u092a \u0938\u0947 \u0936\u0940\u0936\u0947 \u0915\u0940 \u092a\u091f\u094d\u091f\u093f\u092f\u094b\u0902 \u0938\u0947 (\u0906\u0927\u093e\u0930 \u092d\u0940 \u0938\u092e\u094d\u092e\u093f\u0932\u093f\u0924 \u0939\u0948) \u0918\u0930 \u0915\u0947 \u0905\u0928\u094d\u0926\u0930 \u0939\u0940 \u092c\u0928\u093e\u092f\u093e \u0917\u092f\u093e \u0939\u0948 \u0914\u0930 \u0936\u0940\u0936\u0947 \u0915\u0940 \u092a\u091f\u094d\u091f\u093f\u092f\u094b\u0902 \u0915\u094b \u091f\u0947\u092a \u0926\u094d\u0935\u093e\u0930\u093e \u091a\u093f\u092a\u0915\u093e \u0915\u0930 \u0930\u094b\u0915\u093e \u0917\u092f\u093e \u0939\u0948\u0964 \u092f\u0939 \u092a\u094c\u0927\u093e-\u0918\u0930 30 \u0938\u0947\u092e\u0940 \u0932\u092e\u094d\u092c\u093e, 25 \u0938\u0947\u092e\u0940 \u091a\u094c\u0921\u093c\u093e \u0914\u0930 25 \u0938\u0947\u092e\u0940 \u090a\u0901\u091a\u093e \u0939\u0948\u0964<br \/>\n(i) \u0907\u0938\u092e\u0947\u0902 \u092a\u094d\u0930\u092f\u0941\u0915\u094d\u0924 \u0936\u0940\u0936\u0947 \u0915\u0940 \u092a\u091f\u094d\u091f\u093f\u092f\u094b\u0902 \u0915\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 \u0915\u094d\u092f\u093e \u0939\u0948?<br \/>\n(ii) \u0938\u092d\u0940 12 \u0915\u093f\u0928\u093e\u0930\u094b\u0902 \u0915\u0947 \u0932\u093f\u090f \u0915\u093f\u0924\u0928\u0947 \u091f\u0947\u092a \u0915\u0940 \u0906\u0935\u0936\u094d\u092f\u0915\u0924\u093e \u0939\u0948?<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n(i) \u092a\u094c\u0927\u093e-\u0918\u0930 \u0915\u0940 \u0932\u092e\u094d\u092c\u093e\u0908 (l) = 30 \u0938\u0947\u092e\u0940, \u091a\u094c\u0921\u093c\u093e\u0908 (b) = 25 \u0938\u0947\u092e\u0940 \u0935 \u090a\u0901\u091a\u093e\u0908 (h) = 25 \u0938\u0947\u092e\u0940\u0964<br \/>\n\u092a\u094c\u0927\u093e-\u0918\u0930 (\u0917\u094d\u0930\u0940\u0928 \u0939\u093e\u0909\u0938) \u0915\u094b \u0938\u092e\u094d\u092a\u0942\u0930\u094d\u0923 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 2 (lb + bh + hl)<br \/>\n=2 [ (30 x 25) + (25 x 25) + (25 x 30)]<br \/>\n=2 [750 + 625 + 750]<br \/>\n= 2 x 2125<br \/>\n= 4250 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n\u0905\u0924: \u092a\u094c\u0927\u093e-\u0918\u0930 \u092c\u0928\u093e\u0928\u0947 \u092e\u0947\u0902 \u092a\u094d\u0930\u092f\u0941\u0915\u094d\u0924 \u0915\u093e\u0901\u091a \u0915\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = \u092a\u094c\u0927\u093e-\u0918\u0930 (\u0917\u094d\u0930\u0940\u0928 \u0939\u093e\u0909\u0938) \u0915\u093e \u0938\u092e\u094d\u092a\u0942\u0930\u094d\u0923 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 4250 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n(ii) 12 \u0915\u093f\u0928\u093e\u0930\u094b\u0902 \u092e\u0947\u0902 4 \u0932\u092e\u094d\u092c\u093e\u0907\u092f\u093e\u0901, 4 \u091a\u094c\u0921\u093c\u093e\u0907\u092f\u093e\u0901 \u0935 4 \u090a\u0901\u091a\u093e\u0907\u092f\u093e\u0901 \u0939\u094b\u0924\u0940 \u0939\u0948\u0902\u0964<br \/>\n\u0938\u092d\u0940 \u0915\u093f\u0928\u093e\u0930\u094b\u0902 \u0915\u0940 \u092e\u093e\u092a = 4 (\u0932\u092e\u094d\u092c\u093e\u0908 + \u091a\u094c\u0921\u093c\u093e\u0908 + \u090a\u0901\u091a\u093e\u0908) = 4 (30 + 25 + 25) \u0938\u0947\u092e\u0940 = 4 x 80 \u0938\u0947\u092e\u0940 = 320 \u0938\u0947\u092e\u0940<br \/>\n\u0905\u0924\u0903 \u0906\u0935\u0936\u094d\u092f\u0915 \u091f\u0947\u092a \u0915\u0940 \u0932\u092e\u094d\u092c\u093e\u0908 = 320 \u0938\u0947\u092e\u0940<\/p>\n<p><strong>Ex 13.1 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 7.<\/strong><br \/>\n\u0936\u093e\u0928\u094d\u0924\u093f \u0938\u094d\u0935\u0940\u091f \u0938\u094d\u091f\u093e\u0932 \u0905\u092a\u0928\u0940 \u092e\u093f\u0920\u093e\u0907\u092f\u094b\u0902 \u0915\u094b \u092a\u0948\u0915 \u0915\u0930\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u0917\u0924\u094d\u0924\u0947 \u0915\u0947 \u0921\u093f\u092c\u094d\u092c\u0947 \u092c\u0928\u093e\u0928\u0947 \u0915\u093e \u0911\u0930\u094d\u0921\u0930 \u0926\u0947 \u0930\u0939\u093e \u0925\u093e\u0964 \u0926\u094b \u092e\u093e\u092a\u094b\u0902 \u0915\u0947 \u0921\u093f\u092c\u094d\u092c\u094b\u0902 \u0915\u0940 \u0906\u0935\u0936\u094d\u092f\u0915\u0924\u093e \u0925\u0940\u0964 \u092c\u0921\u093c\u0947 \u0921\u093f\u092c\u094d\u092c\u094b\u0902 \u0915\u0940 \u092e\u093e\u092a 25 \u0938\u0947\u092e\u0940 x 20 \u0938\u0947\u092e\u0940 x 5 \u0938\u0947\u092e\u0940 \u0914\u0930 \u091b\u094b\u091f\u0947 \u0921\u093f\u092c\u094d\u092c\u094b\u0902 \u0915\u0940 \u092e\u093e\u092a 15 \u0938\u0947\u092e\u0940 x 12 \u0938\u0947\u092e\u0940 x 5 \u0938\u0947\u092e\u0940 \u0925\u0940\u0902\u0964 \u0938\u092d\u0940 \u092a\u094d\u0930\u0915\u093e\u0930 \u0915\u0940 \u0905\u0924\u093f\u0935\u094d\u092f\u093e\u092a\u094d\u0924\u0924\u093e.(overlaps) \u0915\u0947 \u0932\u093f\u090f \u0915\u0941\u0932 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 \u0915\u0947 5% \u0915\u0947 \u092c\u0930\u093e\u092c\u0930 \u0905\u0924\u093f\u0930\u093f\u0915\u094d\u0924 \u0917\u0924\u094d\u0924\u093e \u0932\u0917\u0947\u0917\u093e\u0964 \u092f\u0926\u093f \u0917\u0924\u094d\u0924\u0947 \u0915\u0940 \u0932\u093e\u0917\u0924 \u20b9 4 \u092a\u094d\u0930\u0924\u093f 1000 \u0938\u0947\u092e\u0940\u00b2 \u0939\u0948, \u0924\u094b \u092a\u094d\u0930\u0924\u094d\u092f\u0947\u0915 \u092a\u094d\u0930\u0915\u093e\u0930 \u0915\u0947 250 \u0921\u093f\u092c\u094d\u092c\u0947 \u092c\u0928\u0935\u093e\u0928\u0947 \u0915\u0940 \u0915\u093f\u0924\u0928\u0940 \u0932\u093e\u0917\u0924 \u0906\u090f\u0917\u0940?<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u092c\u0921\u093c\u0947 \u0921\u093f\u092c\u094d\u092c\u0947 \u0915\u0940 \u0935\u093f\u092e\u093e\u090f\u0901 25 \u0938\u0947\u092e\u0940 x 20 \u0938\u0947\u092e\u0940 x 5 \u0938\u0947\u092e\u0940 \u0939\u0948\u0902\u0964<br \/>\nl = 25 \u0938\u0947\u092e\u0940, b = 20 \u0938\u0947\u092e\u0940 \u0914\u0930 h = 5 \u0938\u0947\u092e\u0940<br \/>\n\u092c\u0921\u093c\u0947 \u0921\u093f\u092c\u094d\u092c\u0947 \u0915\u093e \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 2(lb + bh + hl)<br \/>\n= 2 [(25 x 20) + (20 x 5) + (5 x 25)]<br \/>\n= 2 (500 + 100 + 125)<br \/>\n= 2 x 725<br \/>\n= 1450 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n250 \u0921\u093f\u092c\u094d\u092c\u094b\u0902 \u0915\u093e \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 250 x 1450 = 3,62,500 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n\u091b\u094b\u091f\u0947 \u0921\u093f\u092c\u094d\u092c\u0947 \u0915\u0940 \u0935\u093f\u092e\u093e\u090f\u0901 15 \u0938\u0947\u092e\u0940 x 12 \u0938\u0947\u092e\u0940 x 5 \u0938\u0947\u092e\u0940 \u0939\u0948\u0902\u0964<br \/>\nL = 15 \u0938\u0947\u092e\u0940, B = 12 \u0938\u0947\u092e\u0940 \u0935 H = 5 \u0938\u0947\u092e\u0940<br \/>\n\u091b\u094b\u091f\u0947 \u0921\u093f\u092c\u094d\u092c\u0947 \u0915\u093e \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 2 (LB + BH + HL)<br \/>\n= 2 [ (15 x 12) + (12 x 5) + (5 x 15)]<br \/>\n= 2 [180 + 60 + 75]<br \/>\n= 2 x 315<br \/>\n= 630 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n250 \u0921\u093f\u092c\u094d\u092c\u094b\u0902 \u0915\u093e \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 630 x 250 = 1,57,500 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n\u092a\u094d\u0930\u0924\u094d\u092f\u0947\u0915 \u092a\u094d\u0930\u0915\u093e\u0930 \u0915\u0947 250 \u0921\u093f\u092c\u094d\u092c\u094b\u0902 \u0915\u093e \u0915\u0941\u0932 \u092a\u0943\u0937\u094d\u0920 = (3,62,500 + 1,57,500) \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940 = 5,20,000 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n\u0905\u0924\u093f\u0935\u094d\u092f\u093e\u092a\u094d\u0924\u0924\u093e (overlaps) \u0915\u0947 \u0932\u093f\u090f \u0906\u0930\u0915\u094d\u0937\u093f\u0924 \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 5,20,000 \u0915\u093e 5% = 5,20,000 x \\(\\frac { 5 }{ 100 }\\) = 26,000 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n\u0921\u093f\u092c\u094d\u092c\u094b\u0902 \u0915\u0947 \u0928\u093f\u0930\u094d\u092e\u093e\u0923 \u092e\u0947\u0902 \u0932\u0917\u0947 \u0917\u0924\u094d\u0924\u0947 \u0915\u093e \u0915\u0941\u0932 \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = (5,20,000 + 26,000) \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940 = 5,46,000 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n\u0921\u093f\u092c\u094d\u092c\u094b\u0902 \u0915\u0947 \u0928\u093f\u0930\u094d\u092e\u093e\u0923 \u0939\u0947\u0924\u0941 \u0932\u093e\u0917\u0924 = \u0915\u0941\u0932 \u0917\u0924\u094d\u0924\u0947 \u0915\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 x \u092e\u0942\u0932\u094d\u092f-\u0926\u0930 = 5,46,000 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940 x \u20b9 4 \u092a\u094d\u0930\u0924\u093f \u0939\u091c\u093e\u0930 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n= \\(\\frac { 546000 x 4 }{ 100 }\\) = \u20b9 2184<br \/>\n\u0905\u0924: \u092a\u094d\u0930\u0924\u094d\u092f\u0947\u0915 \u092a\u094d\u0930\u0915\u093e\u0930 \u0915\u0947 250 \u0921\u093f\u092c\u094d\u092c\u0947 \u092c\u0928\u0935\u093e\u0928\u0947 \u0915\u0940 \u0932\u093e\u0917\u0924 = \u20b9 2184<\/p>\n<p><strong>Ex 13.1 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 8.<\/strong><br \/>\n\u092a\u0930\u0935\u0940\u0928 \u0905\u092a\u0928\u0940 \u0915\u093e\u0930 \u0916\u0921\u093c\u0940 \u0915\u0930\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f, \u090f\u0915 \u0938\u0928\u094d\u0926\u0942\u0915 \u0915\u0947 \u092a\u094d\u0930\u0915\u093e\u0930 \u0915\u0947 \u0922\u093e\u0901\u091a\u0947 \u091c\u0948\u0938\u093e \u090f\u0915 \u0905\u0938\u094d\u0925\u093e\u092f\u0940 \u0938\u094d\u0925\u093e\u0928 \u0924\u093f\u0930\u092a\u093e\u0932 \u0915\u0940 \u0938\u0939\u093e\u092f\u0924\u093e \u0938\u0947 \u092c\u0928\u093e\u0928\u093e \u091a\u093e\u0939\u0924\u0940 \u0939\u0948, \u091c\u094b \u0915\u093e\u0930 \u0915\u094b \u091a\u093e\u0930\u094b\u0902 \u0913\u0930 \u0938\u0947 \u090a\u092a\u0930 \u0938\u0947 \u0922\u0915 \u0932\u0947 (\u0938\u093e\u092e\u0928\u0947 \u0935\u093e\u0932\u093e \u092b\u0932\u0915 \u0932\u091f\u0915\u093e \u0939\u0941\u0906 \u0939\u094b\u0917\u093e \u091c\u093f\u0938\u0947 \u0918\u0941\u092e\u093e\u0915\u0930 \u090a\u092a\u0930 \u0915\u093f\u092f\u093e \u091c\u093e \u0938\u0915\u0924\u093e \u0939\u0948)\u0964 \u092f\u0939 \u092e\u093e\u0928\u0924\u0947 \u0939\u0941\u090f \u0915\u093f \u0938\u093f\u0932\u093e\u0908 \u0915\u0947 \u0938\u092e\u092f \u0932\u0917\u093e \u0924\u093f\u0930\u092a\u093e\u0932 \u0915\u093e \u0905\u0924\u093f\u0930\u093f\u0915\u094d\u0924 \u0915\u092a\u0921\u093c\u093e \u0928\u0917\u0923\u094d\u092f \u0939\u094b\u0917\u093e, \u0906\u0927\u093e\u0930 \u0935\u093f\u092e\u093e\u0913\u0902 4 \u092e\u0940\u091f\u0930 x 3 \u092e\u0940\u091f\u0930 \u0914\u0930 \u090a\u0901\u091a\u093e\u0908 2.5 \u092e\u0940\u091f\u0930 \u0935\u093e\u0932\u0947 \u0907\u0938 \u0922\u093e\u0901\u091a\u0947 \u0915\u094b \u092c\u0928\u093e\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u0915\u093f\u0924\u0928\u0947 \u0924\u093f\u0930\u092a\u093e\u0932 \u0915\u0940 \u0906\u0935\u0936\u094d\u092f\u0915\u0924\u093e \u0939\u094b\u0917\u0940?<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u0922\u093e\u0901\u091a\u0947 \u0915\u0940 \u0935\u093f\u092e\u093e\u090f\u0901 4 \u092e\u0940\u091f\u0930 x 3 \u092e\u0940\u091f\u0930 x 2.5 \u092e\u0940\u091f\u0930 \u0939\u0948\u0902\u0964<br \/>\nl = 4 \u092e\u0940\u091f\u0930, b = 3 \u092e\u0940\u091f\u0930 \u0935 h = 2.5 \u092e\u0940\u091f\u0930<br \/>\n\u0922\u093e\u0901\u091a\u0947 \u0915\u093e \u092a\u0930\u093f\u0923\u093e\u092e = 2 (\u0932\u092e\u094d\u092c\u093e\u0908 + \u091a\u094c\u0921\u093c\u093e\u0908) = 2 (4 + 3) = 14<br \/>\n\u0922\u093e\u0901\u091a\u0947 \u0915\u093e \u092a\u093e\u0930\u094d\u0936\u094d\u0935 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = \u092a\u0930\u093f\u092e\u093e\u092a x \u090a\u0901\u091a\u093e\u0908 = 14 x 2.5 = 35 \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930<br \/>\n\u091b\u0924 \u092f\u093e \u090a\u092a\u0930 \u0915\u0947 \u092a\u0943\u0937\u094d\u0920 \u0915\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 4 x 3 = 12 \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930<br \/>\n\u0915\u0941\u0932 \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 35 + 12 = 47 \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930<br \/>\n\u0905\u0924: \u0922\u093e\u0901\u091a\u0947 \u0915\u0947 \u0928\u093f\u0930\u094d\u092e\u093e\u0923 \u092e\u0947\u0902 47 \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930 \u0924\u093f\u0930\u092a\u093e\u0932 \u0915\u0940 \u0906\u0935\u0936\u094d\u092f\u0915\u0924\u093e \u0939\u094b\u0917\u0940\u0964<\/p>\n<p style=\"text-align: center;\"><span style=\"color: #0000ff;\"><strong>\u092a\u094d\u0930\u0936\u094d\u0928\u093e\u0935\u0932\u0940 13.2<\/strong><\/span><\/p>\n<p><strong>\u091c\u092c \u0924\u0915 \u0905\u0928\u094d\u092f\u0925\u093e \u0928 \u0915\u0939\u093e \u091c\u093e\u090f, \u03c0 = \\(\\frac { 22 }{ 7 }\\) \u0932\u0940\u091c\u093f\u090f\u0964<\/strong><br \/>\n<strong>Ex 13.2 Class 9 \u0917\u0923\u093f\u0924 \u092a\u094d\u0930\u0936\u094d\u0928 1.<\/strong><br \/>\n\u090a\u0901\u091a\u093e\u0908 14 \u0938\u0947\u092e\u0940 \u0935\u093e\u0932\u0947 \u090f\u0915 \u0932\u092e\u094d\u092c\u0935\u0943\u0924\u094d\u0924\u0940\u092f \u092c\u0947\u0932\u0928 \u0915\u093e \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 88 \u0938\u0947\u092e\u0940\u00b2 \u0939\u0948\u0964 \u092c\u0947\u0932\u0928 \u0915\u0947 \u0906\u0927\u093e\u0930 \u0915\u093e \u0935\u094d\u092f\u093e\u0938 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i1.wp.com\/farm2.staticflickr.com\/1872\/42678463250_04e8be9e04_o.png?resize=582%2C214&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.2 1\" width=\"582\" height=\"214\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.2 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 2.<\/strong><br \/>\n\u0927\u093e\u0924\u0941 \u0915\u0940 \u090f\u0915 \u091a\u093e\u0926\u0930 \u0938\u0947 1 \u092e\u0940\u091f\u0930 \u090a\u0901\u091a\u0940 \u0914\u0930 140 \u0938\u0947\u092e\u0940 \u0935\u094d\u092f\u093e\u0938 \u0915\u0947 \u0906\u0927\u093e\u0930 \u0935\u093e\u0932\u0940 \u090f\u0915 \u092c\u0928\u094d\u0926 \u092c\u0947\u0932\u0928\u093e\u0915\u093e\u0930 \u091f\u0902\u0915\u0940 \u092c\u0928\u093e\u0908 \u091c\u093e\u0928\u0940 \u0939\u0948\u0964 \u0907\u0938 \u0915\u093e\u0930\u094d\u092f \u0915\u0947 \u0932\u093f\u090f \u0915\u093f\u0924\u0928\u0947 \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930 \u091a\u093e\u0926\u0930 \u0915\u0940 \u0906\u0935\u0936\u094d\u092f\u0915\u0924\u093e \u0939\u094b\u0917\u0940?<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1841\/43769549524_55c03b9198_o.png?resize=549%2C225&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.2 2\" width=\"549\" height=\"225\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.2 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 3.<\/strong><br \/>\n\u0938\u0902\u0932\u0917\u094d\u0928 \u091a\u093f\u0924\u094d\u0930 \u092e\u0947\u0902, \u0927\u093e\u0924\u0941 \u0915\u093e \u090f\u0915 \u092a\u093e\u0907\u092a 77 \u0938\u0947\u092e\u0940 \u0932\u092e\u094d\u092c\u093e \u0939\u0948\u0964 \u0907\u0938\u0915\u0947 \u090f\u0915 \u0905\u0928\u0941\u092a\u094d\u0930\u0938\u094d\u0925 \u0915\u093e\u091f \u0915\u093e \u0906\u0928\u094d\u0924\u0930\u093f\u0915 \u0935\u094d\u092f\u093e\u0938 4 \u0938\u0947\u092e\u0940 \u0914\u0930 \u092c\u093e\u0939\u0930\u0940 \u0935\u094d\u092f\u093e\u0938 4.4 \u0938\u0947\u092e\u0940 \u0939\u0948, \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f:<br \/>\n(i) \u0906\u0928\u094d\u0924\u0930\u093f\u0915 \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932<br \/>\n(ii) \u092c\u093e\u0939\u0930\u0940 \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i1.wp.com\/farm2.staticflickr.com\/1890\/44487477471_a788c4a266_o.png?resize=670%2C421&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.2 3\" width=\"670\" height=\"421\" data-recalc-dims=\"1\" \/><br \/>\n<img loading=\"lazy\" src=\"https:\/\/i1.wp.com\/farm2.staticflickr.com\/1868\/42678463450_250c6d3a8e_o.png?resize=620%2C248&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.2 3.1\" width=\"620\" height=\"248\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.2 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 4.<\/strong><br \/>\n\u090f\u0915 \u0930\u094b\u0932\u0930 (roller) \u0915\u093e \u0935\u094d\u092f\u093e\u0938 84 \u0938\u0947\u092e\u0940 \u0939\u0948 \u0914\u0930 \u0932\u092e\u094d\u092c\u093e\u0908 120 \u0938\u0947\u092e\u0940 \u0939\u0948\u0964 \u090f\u0915 \u0916\u0947\u0932 \u0915\u0947 \u092e\u0948\u0926\u093e\u0928 \u0915\u094b \u090f\u0915 \u092c\u093e\u0930 \u0938\u092e\u0924\u0932 \u0915\u0930\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f 500 \u091a\u0915\u094d\u0915\u0930 \u0932\u0917\u093e\u0928\u0947 \u092a\u0921\u093c\u0924\u0947 \u0939\u0948\u0902\u0964 \u0916\u0947\u0932 \u0915\u0947 \u092e\u0948\u0926\u093e\u0928 \u0915\u093e \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930 \u092e\u0947\u0902 \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n\u0939\u0932-<br \/>\n\u0926\u093f\u092f\u093e \u0939\u0948, \u0930\u094b\u0932\u0930 \u0915\u093e \u0935\u094d\u092f\u093e\u0938 = 84 \u0938\u0947\u092e\u0940 = 0.84 \u092e\u0940\u091f\u0930<br \/>\n\u0930\u094b\u0932\u0930 \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e (r) = \\(\\frac { 0.84 }{ 2 }\\) \u092e\u0940\u091f\u0930 = 0.42 \u092e\u0940\u091f\u0930<br \/>\n\u0914\u0930 \u0930\u094b\u0932\u0930 \u0915\u0940 \u0932\u092e\u094d\u092c\u093e\u0908 (l) = 120 \u0938\u0947\u092e\u0940 = 1.20 \u092e\u0940\u091f\u0930<br \/>\n\u0930\u094b\u0932\u0930 \u0915\u093e \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 2\u03c0rh = 2\u03c0rl (h = l)<br \/>\n= 2 x \\(\\frac { 22 }{ 7 }\\) x 0.42 x 120<br \/>\n= 3.168 \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930<br \/>\n\u0930\u094b\u0932\u0930 \u0926\u094d\u0935\u093e\u0930\u093e 1 \u091a\u0915\u094d\u0915\u0930 \u0932\u0917\u093e\u0915\u0930 \u0938\u092e\u0924\u0932 \u0915\u093f\u092f\u093e \u0917\u092f\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 3.168 \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930<br \/>\n\u0930\u094b\u0932\u0930 \u0926\u094d\u0935\u093e\u0930\u093e 500 \u091a\u0915\u094d\u0915\u0930 \u0932\u0917\u093e\u0915\u0930 \u0938\u092e\u0924\u0932 \u0915\u093f\u092f\u093e \u0917\u092f\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 500 x 3.168 = 1584 \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930<br \/>\n\u0905\u0924\u0903 \u0916\u0947\u0932 \u0915\u0947 \u092e\u0948\u0926\u093e\u0928 \u0915\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 1584 \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930<\/p>\n<p><strong>Ex 13.2 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 5.<\/strong><br \/>\n\u0915\u093f\u0938\u0940 \u092c\u0947\u0932\u0928\u093e\u0915\u093e\u0930 \u0938\u094d\u0924\u092e\u094d\u092d \u0915\u093e \u0935\u094d\u092f\u093e\u0938 50 \u0938\u0947\u092e\u0940 \u0939\u0948 \u0914\u0930 \u090a\u0901\u091a\u093e\u0908 3.5 \u092e\u0940\u091f\u0930 \u0939\u0948\u0964 \u20b9 12.50 \u092a\u094d\u0930\u0924\u093f \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930 \u0915\u0940 \u0926\u0930 \u0938\u0947 \u0907\u0938 \u0938\u094d\u0924\u092e\u094d\u092d \u0915\u0947 \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920 \u092a\u0930 \u092a\u0947\u0902\u091f \u0915\u0930\u093e\u0928\u0947 \u0915\u093e \u0935\u094d\u092f\u092f \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u0926\u093f\u092f\u093e \u0939\u0948, \u092c\u0947\u0932\u0928\u093e\u0915\u093e\u0930 \u0938\u094d\u0924\u092e\u094d\u092d \u0915\u093e \u0935\u094d\u092f\u093e\u0938 = 50 \u0938\u0947\u092e\u0940 = 0.5 \u092e\u0940\u091f\u0930<br \/>\n\u092c\u0947\u0932\u0928\u093e\u0915\u093e\u0930 \u0938\u094d\u0924\u092e\u094d\u092d \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e (r) = \\(\\frac { 0.5 }{ 2 }\\) \u092e\u0940\u091f\u0930 = 0.25 \u092e\u0940\u091f\u0930<br \/>\n\u0914\u0930 \u0938\u094d\u0924\u092e\u094d\u092d \u0915\u0940 \u090a\u0901\u091a\u093e\u0908 (h) = 3.5 \u092e\u0940\u091f\u0930<br \/>\n\u092c\u0947\u0932\u0928\u093e\u0915\u093e\u0930 \u0938\u094d\u0924\u092e\u094d\u092d \u0915\u093e \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920 = 2\u03c0rh<br \/>\n= 2 x \\(\\frac { 22 }{ 7 }\\) x 0.25 x 3.5 = 5.5 \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930<br \/>\n\u0938\u094d\u0924\u092e\u094d\u092d \u092a\u0930 \u092a\u0947\u0902\u091f \u0915\u0930\u093e\u0928\u0947 \u0915\u093e \u0935\u094d\u092f\u092f = \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920 x \u0930\u0902\u0917\u0935\u093e\u0928\u0947 \u0915\u0940 \u092e\u0942\u0932\u094d\u092f-\u0926\u0930 = 5.5 x 12.50 = 368.75<br \/>\n\u0905\u0924\u0903 \u0938\u094d\u0924\u092e\u094d\u092d \u092a\u0930 \u092a\u0947\u0902\u091f \u0915\u0930\u093e\u0928\u0947 \u0915\u093e \u0935\u094d\u092f\u092f = \u20b9 68.75<\/p>\n<p><strong>Ex 13.2 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 6.<\/strong><br \/>\n\u090f\u0915 \u0932\u092e\u094d\u092c\u0935\u0943\u0924\u094d\u0924\u0940\u092f \u092c\u0947\u0932\u0928 \u0915\u093e \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 44 \u092e\u0940\u091f\u0930 \u0939\u0948\u0964 \u092f\u0926\u093f \u092c\u0947\u0932\u0928 \u0915\u0947 \u0906\u0927\u093e\u0930 \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e 0.7 \u092e\u0940\u091f\u0930 \u0939\u0948 \u0924\u094b \u0909\u0938\u0915\u0940 \u090a\u0901\u091a\u093e\u0908 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u092e\u093e\u0928\u093e \u0932\u092e\u094d\u092c\u0935\u0943\u0924\u094d\u0924\u0940\u092f \u092c\u0947\u0932\u0928 \u0915\u0940 \u090a\u0901\u091a\u093e\u0908 h \u092e\u0940\u091f\u0930 \u0939\u0948\u0964<br \/>\n\u092c\u0947\u0932\u0928 \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e (r) = 0.7 \u092e\u0940\u091f\u0930<br \/>\n\u092c\u0947\u0932\u0928 \u0915\u093e \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 2\u03c0rh<br \/>\n= 2 x \\(\\frac { 22 }{ 7 }\\) x 0.7 x h = 44h<br \/>\n\u092a\u0930\u0928\u094d\u0924\u0941 \u092a\u094d\u0930\u0936\u094d\u0928 \u092e\u0947\u0902 \u0926\u093f\u092f\u093e \u0917\u092f\u093e \u0939\u0948 \u0915\u093f \u092c\u0947\u0932\u0928 \u0915\u093e \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 44 \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930 \u0939\u0948\u0964<br \/>\n44 h = 44<br \/>\nh = 1 \u092e\u0940\u091f\u0930<br \/>\n\u0905\u0924\u0903 \u092c\u0947\u0932\u0928 \u0915\u0940 \u090a\u0901\u091a\u093e\u0908 = 1\u092e\u0940\u091f\u0930<\/p>\n<p><strong>Ex 13.2 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 7.<\/strong><br \/>\n\u0915\u093f\u0938\u0940 \u0935\u0943\u0924\u094d\u0924\u093e\u0915\u093e\u0930 \u0915\u0941\u090f\u0901 \u0915\u093e \u0906\u0928\u094d\u0924\u0930\u093f\u0915 \u0935\u094d\u092f\u093e\u0938 3.5 \u092e\u0940\u091f\u0930 \u0939\u0948 \u0914\u0930 \u092f\u0939 10 \u092e\u0940\u091f\u0930 \u0917\u0939\u0930\u093e \u0939\u0948\u0964 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f:<br \/>\n(i) \u0906\u0928\u094d\u0924\u0930\u093f\u0915 \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932\u0964<br \/>\n(ii) \u20b9 40 \u092a\u094d\u0930\u0924\u093f \u092e\u0940\u091f\u0930 \u0915\u0940 \u0926\u0930 \u0938\u0947 \u0907\u0938\u0915\u0947 \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920 \u092a\u0930 \u092a\u094d\u0932\u093e\u0938\u094d\u091f\u0930 \u0915\u0930\u093e\u0928\u0947 \u0915\u093e \u0935\u094d\u092f\u092f\u0964<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u0926\u093f\u092f\u093e \u0939\u0948, \u0935\u0943\u0924\u094d\u0924\u093e\u0915\u093e\u0930 \u0915\u0941\u090f\u0901 \u0915\u093e \u0906\u0928\u094d\u0924\u0930\u093f\u0915 \u0935\u094d\u092f\u093e\u0938 = 3.5 \u092e\u0940\u091f\u0930<br \/>\n\u0935\u0943\u0924\u094d\u0924\u093e\u0915\u093e\u0930 \u0915\u0941\u090f\u0901 \u0915\u0940 \u0906\u0928\u094d\u0924\u0930\u093f\u0915 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e (r) = \\(\\frac { 3.5 }{ 2 }\\) \u092e\u0940\u091f\u0930<br \/>\n\u0924\u0925\u093e \u0915\u0941\u090f\u0901 \u0915\u0940 \u0917\u0939\u0930\u093e\u0908 (h) = 10 \u092e\u0940\u091f\u0930<br \/>\n(i) \u0906\u0928\u094d\u0924\u0930\u093f\u0915 \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 2\u03c0rh<br \/>\n= 2 x \\(\\frac { 22 }{ 7 }\\) x \\(\\frac { 3.5 }{ 2 }\\) x 10 = 110 \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930<br \/>\n(ii) \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920 \u092a\u0930 \u092a\u094d\u0932\u093e\u0938\u094d\u091f\u0930 \u0915\u0930\u093e\u0928\u0947 \u0915\u093e \u0935\u094d\u092f\u092f = \u0915\u0941\u090f\u0901 \u0915\u093e \u0906\u0928\u094d\u0924\u0930\u093f\u0915 \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 x \u092a\u094d\u0932\u093e\u0938\u094d\u091f\u0930 \u0915\u093e \u092a\u094d\u0930\u0924\u093f \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930 \u092e\u0942\u0932\u094d\u092f<br \/>\n= 110 x 40 = 4400<\/p>\n<p><strong>Ex 13.2 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 8.<\/strong><br \/>\n\u0917\u0930\u092e \u092a\u093e\u0928\u0940 \u0926\u094d\u0935\u093e\u0930\u093e \u0917\u0930\u092e \u0930\u0916\u0928\u0947 \u0935\u093e\u0932\u0947 \u090f\u0915 \u0938\u0902\u092f\u0928\u094d\u0924\u094d\u0930 \u092e\u0947\u0902 28 \u092e\u0940\u091f\u0930 \u0932\u092e\u094d\u092c\u093e\u0908 \u0914\u0930 5 \u0938\u0947\u092e\u0940 \u0935\u094d\u092f\u093e\u0938 \u0935\u093e\u0932\u093e \u090f\u0915 \u092c\u0947\u0932\u0928\u093e\u0915\u093e\u0930 \u092a\u093e\u0907\u092a \u0939\u0948\u0964 \u0907\u0938 \u0938\u0902\u092f\u0928\u094d\u0924\u094d\u0930 \u092e\u0947\u0902 \u0917\u0930\u094d\u092e\u0940 \u0926\u0947\u0928\u0947 \u0935\u093e\u0932\u093e \u0915\u0941\u0932 \u0915\u093f\u0924\u0928\u093e \u092a\u0943\u0937\u094d\u0920 \u0939\u0948?<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u0926\u093f\u092f\u093e \u0939\u0948, \u092c\u0947\u0932\u0928\u093e\u0915\u093e\u0930 \u092a\u093e\u0907\u092a \u0915\u093e \u0935\u094d\u092f\u093e\u0938 = 5 \u0938\u0947\u092e\u0940 = 0.05 \u092e\u0940\u091f\u0930<br \/>\n\u092c\u0947\u0932\u0928\u093e\u0915\u093e\u0930 \u092a\u093e\u0907\u092a \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e (r) = \\(\\frac { 0.05 }{ 2 }\\) = 0.025 \u092e\u0940\u091f\u0930<br \/>\n\u0914\u0930 \u092a\u093e\u0907\u092a \u0915\u0940 \u0932\u092e\u094d\u092c\u093e\u0908 (l) = 28 \u092e\u0940\u091f\u0930<br \/>\n\u092a\u093e\u0907\u092a \u0915\u0940 \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920 = 2\u03c0rh = 2\u03c0rl = 2 x \\(\\frac { 22 }{ 7 }\\) x 0.025 x 28 = 44 \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930<br \/>\n\u0905\u0924: \u0938\u0902\u092f\u0928\u094d\u0924\u094d\u0930 \u092e\u0947\u0902 \u0917\u0930\u094d\u092e\u0940 \u0926\u0947\u0928\u0947 \u0935\u093e\u0932\u093e \u0915\u0941\u0932 \u092a\u0943\u0937\u094d\u0920 = 4.4 \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930<\/p>\n<p><strong>Ex 13.2 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 9.<\/strong><br \/>\n\u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n(i) \u090f\u0915 \u092c\u0947\u0932\u0928\u093e\u0915\u093e\u0930 \u092a\u0947\u091f\u094d\u0930\u094b\u0932 \u0915\u0940 \u092c\u0928\u094d\u0926 \u091f\u0902\u0915\u0940 \u0915\u093e \u092a\u093e\u0930\u094d\u0936\u094d\u0935 \u092f\u093e \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932, \u091c\u093f\u0938\u0915\u093e \u0935\u094d\u092f\u093e\u0938 4.2 \u092e\u0940\u091f\u0930 \u0914\u0930 \u090a\u0901\u091a\u093e\u0908 4.5 \u092e\u0940\u091f\u0930 \u0939\u0948\u0964<br \/>\n(ii) \u0907\u0938 \u091f\u0902\u0915\u0940 \u0915\u094b \u092c\u0928\u093e\u0928\u0947 \u092e\u0947\u0902 \u0915\u0941\u0932 \u0915\u093f\u0924\u0928\u093e \u0907\u0938\u094d\u092a\u093e\u0924 (steel) \u0932\u0917\u093e \u0939\u094b\u0917\u093e, \u092f\u0926\u093f \u0915\u0941\u0932 \u0907\u0938\u094d\u092a\u093e\u0924 \u0915\u093e \\(\\frac { 1 }{ 12 }\\) \u092d\u093e\u0917 \u092c\u0928\u093e\u0928\u0947 \u092e\u0947\u0902 \u0928\u0937\u094d\u091f \u0939\u094b \u0917\u092f\u093e \u0939\u0948?<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1873\/43578313355_3ff4e3afa2_o.png?resize=630%2C245&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.2 9\" width=\"630\" height=\"245\" data-recalc-dims=\"1\" \/><br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1882\/42678463560_660604fdfb_o.png?resize=576%2C228&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.2 9.1\" width=\"576\" height=\"228\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.2 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 10.<\/strong><br \/>\n\u0906\u0915\u0943\u0924\u093f \u092e\u0947\u0902, \u0906\u092a \u090f\u0915 \u0932\u0948\u092e\u094d\u092a \u0936\u0947\u0921 \u0915\u093e \u092b\u094d\u0930\u0947\u092e \u0926\u0947\u0916 \u0930\u0939\u0947 \u0939\u0948\u0902\u0964 \u0907\u0938\u0947 \u090f\u0915 \u0938\u091c\u093e\u0935\u091f\u0940 \u0915\u092a\u0921\u093c\u0947 \u0938\u0947 \u0922\u0915\u093e \u091c\u093e\u0928\u093e \u0939\u0948\u0964 \u0907\u0938 \u092b\u094d\u0930\u0947\u092e \u0915\u0947 \u0906\u0927\u093e\u0930 \u0915\u093e \u0935\u094d\u092f\u093e\u0938 20 \u0938\u0947\u092e\u0940 \u0939\u0948 \u0914\u0930 \u090a\u0901\u091a\u093e\u0908 30 \u0938\u0947\u092e\u0940 \u0939\u0948\u0964 \u092b\u094d\u0930\u0947\u092e \u0915\u0947 \u090a\u092a\u0930 \u0914\u0930 \u0928\u0940\u091a\u0947 \u092e\u094b\u0921\u093c\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u0926\u094b\u0928\u094b\u0902 \u0913\u0930 2.5 \u0938\u0947\u092e\u0940 \u0905\u0924\u093f\u0930\u093f\u0915\u094d\u0924 \u0915\u092a\u0921\u093c\u093e \u092d\u0940 \u091b\u094b\u0921\u093c\u093e \u091c\u093e\u0928\u093e \u0939\u0948\u0964 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f \u0915\u093f \u0932\u0948\u092e\u094d\u092a \u0936\u0947\u0921 \u0915\u094b \u0922\u0915\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u0915\u0941\u0932 \u0915\u093f\u0924\u0928\u0947 \u0915\u092a\u0921\u093c\u0947 \u0915\u0940 \u0906\u0935\u0936\u094d\u092f\u0915\u0924\u093e \u0939\u094b\u0917\u0940\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm2.staticflickr.com\/1859\/44487477591_4a27f5eeed_o.png?resize=117%2C117&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.2 10\" width=\"117\" height=\"117\" data-recalc-dims=\"1\" \/><br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u0932\u0948\u092e\u094d\u092a \u0936\u0947\u0921 \u0935\u0943\u0924\u094d\u0924\u093e\u0915\u093e\u0930 \u0939\u0948\u0964<br \/>\n\u0932\u0948\u092e\u094d\u092a \u0936\u0947\u0921 \u0915\u093e \u0935\u094d\u092f\u093e\u0938 = 20 \u0938\u0947\u092e\u0940<br \/>\n\u0932\u0948\u092e\u094d\u092a \u0936\u0947\u0921 \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e (r) = \\(\\frac { 20 }{ 2 }\\) \u0938\u0947\u092e\u0940 = 10 \u0938\u0947\u092e\u0940<br \/>\n\u0914\u0930 \u0932\u0948\u092e\u094d\u092a \u0936\u0947\u0921 \u0915\u0940 \u090a\u0901\u091a\u093e\u0908 = 30 \u0938\u0947\u092e\u0940<br \/>\n\u0932\u0948\u092e\u094d\u092a \u0936\u0947\u0921 \u0915\u094b \u0938\u091c\u093e\u0928\u0947 \u092e\u0947\u0902 \u0926\u094b\u0928\u094b\u0902 \u0913\u0930 2.5 \u0938\u0947\u092e\u0940 \u0915\u092a\u0921\u093c\u093e \u0905\u0924\u093f\u0930\u093f\u0915\u094d\u0924 \u091b\u094b\u0921\u093c\u093e \u091c\u093e\u0924\u093e \u0939\u0948\u0964<br \/>\n\u0915\u092a\u0921\u093c\u0947 \u0915\u0940 \u0932\u092e\u094d\u092c\u093e\u0908 (l) = (30 + 2.5 + 2.5) \u0938\u0947\u092e\u0940 = 35 \u0938\u0947\u092e\u0940<br \/>\n\u0915\u092a\u0921\u093c\u0947 \u0915\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 2\u03c0rh = 2\u03c0rl [h = l]<br \/>\n= 2 x \\(\\frac { 22 }{ 7 }\\) x 10 x 35 = 2200 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n\u0905\u0924: \u0932\u0948\u092e\u094d\u092a \u0936\u0947\u0921 \u0915\u094b \u0922\u0915\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u0906\u0935\u0936\u094d\u092f\u0915 \u0915\u092a\u0921\u093c\u0947 \u0915\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 2200 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940 \u0939\u094b\u0917\u093e\u0964<\/p>\n<p><strong>Ex 13.2 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 11.<\/strong><br \/>\n\u0915\u093f\u0938\u0940 \u0935\u093f\u0926\u094d\u092f\u093e\u0932\u092f \u0915\u0947 \u0935\u093f\u0926\u094d\u092f\u093e\u0930\u094d\u0925\u093f\u092f\u094b\u0902 \u0938\u0947 \u090f\u0915 \u0906\u0927\u093e\u0930 \u0935\u093e\u0932\u0947 \u092c\u0947\u0932\u0928\u093e\u0915\u093e\u0930 \u0915\u0932\u092e\u0926\u093e\u0928\u094b\u0902 \u0915\u094b \u0917\u0924\u094d\u0924\u0947 \u0938\u0947 \u092c\u0928\u093e\u0928\u0947 \u0914\u0930 \u0938\u091c\u093e\u0928\u0947 \u0915\u0940 \u092a\u094d\u0930\u0924\u093f\u092f\u094b\u0917\u093f\u0924\u093e \u092e\u0947\u0902 \u092d\u093e\u0917 \u0932\u0947\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u0915\u0939\u093e \u0917\u092f\u093e\u0964 \u092a\u094d\u0930\u0924\u094d\u092f\u0947\u0915 \u0915\u0932\u092e\u0926\u093e\u0928 \u0915\u094b 3 \u0938\u0947\u092e\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e \u0914\u0930 10.5 \u0938\u0947\u092e\u0940 \u090a\u0901\u091a\u093e\u0908 \u0915\u093e \u0939\u094b\u0928\u093e \u0925\u093e\u0964 \u0935\u093f\u0926\u094d\u092f\u093e\u0932\u092f \u0915\u094b \u0907\u0938\u0915\u0947 \u0932\u093f\u090f \u092a\u094d\u0930\u0924\u093f\u092d\u093e\u0917\u093f\u092f\u094b\u0902 \u0915\u094b \u0917\u0924\u094d\u0924\u093e \u0926\u0947\u0928\u093e \u0925\u093e\u0964 \u092f\u0926\u093f \u0907\u0938\u092e\u0947\u0902 35 \u092a\u094d\u0930\u0924\u093f\u092d\u093e\u0917\u0940 \u0925\u0947, \u0924\u094b \u0935\u093f\u0926\u094d\u092f\u093e\u0932\u092f \u0915\u094b \u0915\u093f\u0924\u0928\u093e \u0917\u0924\u094d\u0924\u093e \u0916\u0930\u0940\u0926\u0928\u093e \u092a\u0921\u093c\u093e \u0939\u094b\u0917\u093e?<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1900\/44487478311_ed4c930a2d_o.png?resize=636%2C253&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.2 11\" width=\"636\" height=\"253\" data-recalc-dims=\"1\" \/><br \/>\n<img loading=\"lazy\" src=\"https:\/\/i1.wp.com\/farm2.staticflickr.com\/1894\/44487477961_0d4b7c5d47_o.png?resize=556%2C132&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.2 11.1\" width=\"556\" height=\"132\" data-recalc-dims=\"1\" \/><\/p>\n<p style=\"text-align: center;\"><span style=\"color: #0000ff;\"><strong>\u092a\u094d\u0930\u0936\u094d\u0928\u093e\u0935\u0932\u0940 13.3<\/strong><\/span><\/p>\n<p><strong>\u091c\u092c \u0924\u0915 \u0905\u0928\u094d\u092f\u0925\u093e \u0928 \u0915\u0939\u093e \u091c\u093e\u090f \u03c0 = \\(\\frac { 22 }{ 7 }\\) \u0932\u0940\u091c\u093f\u090f\u0964<\/strong><br \/>\n<strong>Ex 13.3 Class 9 \u0917\u0923\u093f\u0924 \u092a\u094d\u0930\u0936\u094d\u0928 1.<\/strong><br \/>\n\u090f\u0915 \u0936\u0902\u0915\u0941 \u0915\u0947 \u0906\u0927\u093e\u0930 \u0915\u093e \u0935\u094d\u092f\u093e\u0938 10.5 \u0938\u0947\u092e\u0940 \u0939\u0948 \u0914\u0930 \u0907\u0938\u0915\u0940 \u0924\u093f\u0930\u094d\u092f\u0915 \u090a\u0901\u091a\u093e\u0908 10 \u0938\u0947\u092e\u0940 \u0939\u0948\u0964 \u0907\u0938\u0915\u093e \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm2.staticflickr.com\/1867\/44487478531_2cc9c029d4_o.png?resize=518%2C161&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.3 1\" width=\"518\" height=\"161\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.3 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 2.<\/strong><br \/>\n\u090f\u0915 \u0936\u0902\u0915\u0941 \u0915\u093e \u0915\u0941\u0932 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f, \u091c\u093f\u0938\u0915\u0940 \u0924\u093f\u0930\u094d\u092f\u0915 \u090a\u0901\u091a\u093e\u0908 12 \u092e\u0940\u091f\u0930 \u0914\u0930 \u0906\u0927\u093e\u0930 \u0915\u093e \u0935\u094d\u092f\u093e\u0938 24 \u092e\u0940\u091f\u0930 \u0939\u0948\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1869\/44487478651_bcd59bc753_o.png?resize=654%2C242&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.3 2\" width=\"654\" height=\"242\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.3 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 3.<\/strong><br \/>\n\u090f\u0915 \u0936\u0902\u0915\u0941 \u0915\u093e \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 308 \u0938\u0947\u092e\u0940<sup>2<\/sup> \u0939\u0948 \u0914\u0930 \u0907\u0938\u0915\u0940 \u0924\u093f\u0930\u094d\u092f\u0915 \u090a\u0901\u091a\u093e\u0908 14 \u0938\u0947\u092e\u0940 \u0939\u0948\u0964 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f :<br \/>\n(i) \u0906\u0927\u093e\u0930 \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e,<br \/>\n(ii) \u0936\u0902\u0915\u0941 \u0915\u094b \u0915\u0941\u0932 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm2.staticflickr.com\/1892\/44438514082_6205e9e565_o.png?resize=542%2C224&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.3 3\" width=\"542\" height=\"224\" data-recalc-dims=\"1\" \/><br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm2.staticflickr.com\/1868\/44487479211_17cc5417f8_o.png?resize=565%2C201&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.3 3.1\" width=\"565\" height=\"201\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.3 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 4.<\/strong><br \/>\n\u0936\u0902\u0915\u0941 \u0915\u0947 \u0906\u0915\u093e\u0930 \u0915\u093e \u090f\u0915 \u0924\u092e\u094d\u092c\u0942 10 \u092e\u0940\u091f\u0930 \u090a\u0901\u091a\u093e \u0939\u0948 \u0914\u0930 \u0909\u0938\u0915\u0947 \u0906\u0927\u093e\u0930 \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e 24 \u092e\u0940\u091f\u0930 \u0939\u0948\u0964 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f:<br \/>\n(i) \u0924\u092e\u094d\u092c\u0942 \u0915\u0940 \u0924\u093f\u0930\u094d\u092f\u0915 \u090a\u0901\u091a\u093e\u0908<br \/>\n(ii) \u0924\u092e\u094d\u092c\u0942 \u092e\u0947\u0902 \u0932\u0917\u0947 \u0915\u0948\u0928\u0935\u093e\u0938 (canvas) \u0915\u0940 \u0932\u093e\u0917\u0924, \u092f\u0926\u093f 1 \u092e\u0940\u091f\u0930\u00b2 \u0915\u0948\u0928\u0935\u093e\u0938 \u0915\u0940 \u0932\u093e\u0917\u0924 \u20b9 70 \u0939\u0948\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1899\/44438514142_c4f4e6b422_o.png?resize=653%2C326&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.3 4\" width=\"653\" height=\"326\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.3 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 5.<\/strong><br \/>\n8 \u092e\u0940\u091f\u0930 \u090a\u0901\u091a\u093e\u0908 \u0914\u0930 \u0906\u0927\u093e\u0930 \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e 6 \u092e\u0940\u091f\u0930 \u0935\u093e\u0932\u0947 \u090f\u0915 \u0936\u0902\u0915\u0941 \u0915\u0947 \u0906\u0915\u093e\u0930 \u0915\u093e \u0924\u092e\u094d\u092c\u0942 \u092c\u0928\u093e\u0928\u0947 \u092e\u0947\u0902 3 \u092e\u0940\u091f\u0930 \u091a\u094c\u0921\u093c\u0947 \u0924\u093f\u0930\u092a\u093e\u0932 \u0915\u0940 \u0915\u093f\u0924\u0928\u0940 \u0932\u092e\u094d\u092c\u093e\u0908 \u0932\u0917\u0947\u0917\u0940? \u092f\u0939 \u092e\u093e\u0928 \u0915\u0930 \u091a\u0932\u093f\u090f \u0915\u093f \u0907\u0938\u0915\u0940 \u0938\u093f\u0932\u093e\u0908 \u0914\u0930 \u0915\u0941\u091f\u093e\u0908 \u092e\u0947\u0902 20 \u0938\u0947\u092e\u0940 \u0924\u093f\u0930\u092a\u093e\u0932 \u0905\u0924\u093f\u0930\u093f\u0915\u094d\u0924 \u0932\u0917\u0947\u0917\u093e\u0964 (\u03c0 = 3.14) \u0915\u093e \u092a\u094d\u0930\u092f\u094b\u0917 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i1.wp.com\/farm2.staticflickr.com\/1852\/44438514202_e10c074558_o.png?resize=660%2C304&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.3 5\" width=\"660\" height=\"304\" data-recalc-dims=\"1\" \/><br \/>\n\u0938\u093f\u0932\u093e\u0908 \u0907\u0924\u094d\u092f\u093e\u0926\u093f \u092e\u0947\u0902 \u092a\u094d\u0930\u092f\u0941\u0915\u094d\u0924 \u0924\u093f\u0930\u092a\u093e\u0932 = 20 \u0938\u0947\u092e\u0940 = 0.20 \u092e\u0940\u091f\u0930<br \/>\n\u0905\u0924\u0903 \u0924\u093f\u0930\u092a\u093e\u0932 \u0915\u0940 \u0915\u0941\u0932 \u0932\u092e\u094d\u092c\u093e\u0908 = (62.80 + 0.20) \u092e\u0940\u091f\u0930 = 63 \u092e\u0940\u091f\u0930<\/p>\n<p><strong>Ex 13.3 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 6.<\/strong><br \/>\n\u0936\u0902\u0915\u0941 \u0915\u0947 \u0906\u0927\u093e\u0930 \u0915\u0940 \u090f\u0915 \u0917\u0941\u092e\u094d\u092c\u091c \u0915\u0940 \u0924\u093f\u0930\u094d\u092f\u0915 \u090a\u0901\u091a\u093e\u0908 \u0914\u0930 \u0906\u0927\u093e\u0930 \u0915\u093e \u0935\u094d\u092f\u093e\u0938 \u0915\u094d\u0930\u092e\u0936\u0903 25 \u092e\u0940\u091f\u0930 \u0914\u0930 14 \u092e\u0940\u091f\u0930 \u0939\u0948\u0964 \u0907\u0938\u0915\u0940 \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920 \u092a\u0930 \u20b9 210 \u092a\u094d\u0930\u0924\u093f 100 \u092e\u0940\u091f\u0930\u00b2 \u0915\u0940 \u0926\u0930 \u0938\u0947 \u0938\u092b\u0947\u0926\u0940 \u0915\u0930\u093e\u0928\u0947 \u0915\u093e \u0935\u094d\u092f\u092f \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i1.wp.com\/farm2.staticflickr.com\/1877\/44487479471_0e304cf907_o.png?resize=577%2C304&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.3 6\" width=\"577\" height=\"304\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.3 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 7.<\/strong><br \/>\n\u090f\u0915 \u091c\u094b\u0915\u0930 \u0915\u0940 \u091f\u094b\u092a\u0940 \u090f\u0915 \u0936\u0902\u0915\u0941 \u0915\u0947 \u0906\u0915\u093e\u0930 \u0915\u0940 \u0939\u0948, \u091c\u093f\u0938\u0915\u0947 \u0906\u0927\u093e\u0930 \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e\u0928 \u0938\u0947\u092e\u0940 \u0914\u0930 \u090a\u0901\u091a\u093e\u0908 24 \u0938\u0947\u092e\u0940 \u0939\u0948\u0964 \u0907\u0938\u0940 \u092a\u094d\u0930\u0915\u093e\u0930 \u0915\u0940 10 \u091f\u094b\u092a\u093f\u092f\u093e\u0901 \u092c\u0928\u093e\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u0906\u0935\u0936\u094d\u092f\u0915 \u0917\u0924\u094d\u0924\u0947 \u0915\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1864\/44487479701_1fb0f827fe_o.png?resize=672%2C270&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.3 7\" width=\"672\" height=\"270\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.3 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 8.<\/strong><br \/>\n\u0915\u093f\u0938\u0940 \u092c\u0938 \u0938\u094d\u091f\u0949\u092a \u0915\u094b \u092a\u0941\u0930\u093e\u0928\u0947 \u0917\u0924\u094d\u0924\u0947 \u0938\u0947 \u092c\u0928\u0947 50 \u0916\u094b\u0916\u0932\u0947 \u0936\u0902\u0915\u0941\u0913\u0902 \u0926\u094d\u0935\u093e\u0930\u093e \u0938\u0921\u093c\u0915 \u0938\u0947 \u0905\u0932\u0917 \u0915\u093f\u092f\u093e \u0939\u0941\u0906 \u0939\u0948\u0964 \u092a\u094d\u0930\u0924\u094d\u092f\u0947\u0915 \u0936\u0902\u0915\u0941 \u0915\u0947 \u0906\u0927\u093e\u0930 \u0915\u093e \u0935\u094d\u092f\u093e\u0938 40 \u0938\u0947\u092e\u0940 \u0939\u0948 \u0914\u0930 \u090a\u0901\u091a\u093e\u0908 1 \u092e\u0940\u091f\u0930 \u0939\u0948\u0964 \u092f\u0926\u093f \u0907\u0928 \u0936\u0902\u0915\u0941\u0913\u0902 \u0915\u0940 \u092c\u093e\u0939\u0930\u0940 \u092a\u0943\u0937\u094d\u0920\u094b\u0902 \u0915\u094b \u092a\u0947\u0902\u091f \u0915\u0930\u0935\u093e\u0928\u093e \u0939\u0948 \u0914\u0930 \u092a\u0947\u0902\u091f \u0915\u0940 \u0926\u0930 \u20b9 12 \u092a\u094d\u0930\u0924\u093f \u092e\u0940\u091f\u0930\u00b2 \u0939\u0948 \u0924\u094b \u0907\u0928\u0915\u094b \u092a\u0947\u0902\u091f \u0915\u0930\u093e\u0928\u0947 \u092e\u0947\u0902 \u0915\u093f\u0924\u0928\u0940 \u0932\u093e\u0917\u0924 \u0906\u090f\u0917\u0940? ( \u03c0 = 3.14 \u0914\u0930 \u221a1.04 = 1.02 \u0915\u093e \u092a\u094d\u0930\u092f\u094b\u0917 \u0915\u0940\u091c\u093f\u090f\u0964)<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i1.wp.com\/farm2.staticflickr.com\/1894\/44487479971_8b8144e60c_o.png?resize=504%2C128&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.3 8\" width=\"504\" height=\"128\" data-recalc-dims=\"1\" \/><br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1892\/44487479801_44cd41a16c_o.png?resize=565%2C211&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.3 8.1\" width=\"565\" height=\"211\" data-recalc-dims=\"1\" \/><\/p>\n<p style=\"text-align: center;\"><span style=\"color: #0000ff;\"><strong>\u092a\u094d\u0930\u0936\u094d\u0928\u093e\u0935\u0932\u0940 13.4<\/strong><\/span><\/p>\n<p><strong>\u091c\u092c \u0924\u0915 \u0905\u0928\u094d\u092f\u0925\u093e \u0928 \u0915\u0939\u093e \u091c\u093e\u090f, \u03c0 = \\(\\frac { 22 }{ 7 }\\) \u0932\u0940\u091c\u093f\u090f\u0964<\/strong><br \/>\n<strong>Ex 13.4 Class 9 \u0917\u0923\u093f\u0924 \u092a\u094d\u0930\u0936\u094d\u0928 1.<\/strong><br \/>\n\u0928\u093f\u092e\u094d\u0928 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e \u0935\u093e\u0932\u0947 \u0917\u094b\u0932\u0947 \u0915\u093e \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n(i) 10.5 \u0938\u0947\u092e\u0940<br \/>\n(ii) 5.6 \u0938\u0947\u092e\u0940<br \/>\n(iii) 14 \u0938\u0947\u092e\u0940\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i1.wp.com\/farm2.staticflickr.com\/1855\/44487480141_ac140b92fa_o.png?resize=587%2C282&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.4 1\" width=\"587\" height=\"282\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.4 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 2.<\/strong><br \/>\n\u0928\u093f\u092e\u094d\u0928 \u0935\u094d\u092f\u093e\u0938 \u0935\u093e\u0932\u0947 \u0917\u094b\u0932\u0947 \u0915\u093e \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f :<br \/>\n(i) 14 \u0938\u0947\u092e\u0940,<br \/>\n(ii) 21 \u0938\u0947\u092e\u0940,<br \/>\n(iii) 35 \u092e\u0940\u091f\u0930\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i1.wp.com\/farm2.staticflickr.com\/1891\/44487480431_24f2c8e916_o.png?resize=513%2C384&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.4 2\" width=\"513\" height=\"384\" data-recalc-dims=\"1\" \/><br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1880\/44487480301_307f6ed2d0_o.png?resize=498%2C84&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.4 2.1\" width=\"498\" height=\"84\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.4 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 3.<\/strong><br \/>\n10 \u0938\u0947\u092e\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e \u0935\u093e\u0932\u0947 \u090f\u0915 \u0905\u0930\u094d\u0927\u0917\u094b\u0932\u0947 \u0915\u093e \u0915\u0941\u0932 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm2.staticflickr.com\/1843\/44487480771_6b21d8ce0b_o.png?resize=678%2C226&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.4 3\" width=\"678\" height=\"226\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.4 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 4.<\/strong><br \/>\n\u090f\u0915 \u0917\u094b\u0932\u093e\u0915\u093e\u0930 \u0917\u0941\u092c\u094d\u092c\u093e\u0930\u0947 \u092e\u0947\u0902 \u0939\u0935\u093e \u092d\u0930\u0928\u0947 \u092a\u0930, \u0909\u0938\u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e 7 \u0938\u0947\u092e\u0940 \u0938\u0947 14 \u0938\u0947\u092e\u0940 \u0939\u094b \u091c\u093e\u0924\u0940 \u0939\u0948\u0964 \u0907\u0928 \u0926\u094b\u0928\u094b\u0902 \u0938\u094d\u0925\u093f\u0924\u093f\u092f\u094b\u0902 \u092e\u0947\u0902, \u0917\u0941\u092c\u094d\u092c\u093e\u0930\u0947 \u0915\u0947 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932\u094b\u0902 \u0915\u093e \u0905\u0928\u0941\u092a\u093e\u0924 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u0926\u093f\u092f\u093e \u0939\u0948, \u092a\u0939\u0932\u0947 \u0917\u0941\u092c\u094d\u092c\u093e\u0930\u0947 \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e (r) = 7 \u0938\u0947\u092e\u0940<br \/>\n\u0917\u0941\u092c\u094d\u092c\u093e\u0930\u0947 \u0915\u093e \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 4\u03c0r\u00b2 = 4 x \u03c0 x 7 x 7 = 196\u03c0 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n\u0939\u0935\u093e \u092d\u0930\u0928\u0947 \u0915\u0947 \u092c\u093e\u0926 \u0917\u0941\u092c\u094d\u092c\u093e\u0930\u0947 \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e (R) = 14 \u0938\u0947\u092e\u0940\u0964<br \/>\n\u0939\u0935\u093e \u092d\u0930\u0928\u0947 \u0915\u0947 \u092c\u093e\u0926 \u0917\u0941\u092c\u094d\u092c\u093e\u0930\u0947 \u0915\u093e \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 4\u03c0R\u00b2 = 4 \u03c0 x 14 x 14 = 784 \u03c0 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940\u0964<br \/>\n\u0905\u0924: \u0917\u0941\u092c\u094d\u092c\u093e\u0930\u0947 \u0915\u0947 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932\u094b\u0902 \u092e\u0947\u0902 \u0905\u0928\u0941\u092a\u093e\u0924 = 196\u03c0 : 784 \u03c0 = 1 : 4<\/p>\n<p><strong>Ex 13.4 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 5.<\/strong><br \/>\n\u092a\u0940\u0924\u0932 \u0938\u0947 \u092c\u0928\u0947 \u090f\u0915 \u0905\u0930\u094d\u0926\u094d\u0927\u0917\u094b\u0932\u093e\u0915\u093e\u0930 \u0915\u091f\u094b\u0930\u0947 \u0915\u093e \u0906\u0928\u094d\u0924\u0930\u093f\u0915 \u0935\u094d\u092f\u093e\u0938 10.5 \u0938\u0947\u092e\u0940 \u0939\u0948\u0964 \u20b916 \u092a\u094d\u0930\u0924\u093f 100 \u0938\u0947\u092e\u0940\u00b2 \u0915\u0940 \u0926\u0930 \u0938\u0947 \u0907\u0938\u0915\u0947 \u0906\u0928\u094d\u0924\u0930\u093f\u0915 \u092a\u0943\u0937\u094d\u0920 \u092a\u0930 \u0915\u0932\u0908 \u0915\u0930\u093e\u0928\u0947 \u0915\u093e \u0935\u094d\u092f\u092f \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i1.wp.com\/farm2.staticflickr.com\/1877\/44487481041_7557c73795_o.png?resize=607%2C270&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.4 5\" width=\"607\" height=\"270\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.4 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 6.<\/strong><br \/>\n\u0909\u0938 \u0917\u094b\u0932\u0947 \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f \u091c\u093f\u0938\u0915\u093e \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 154 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940 \u0939\u0948\u0964<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u092e\u093e\u0928\u093e \u0917\u094b\u0932\u0947 \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e r \u0938\u0947\u092e\u0940 \u0939\u0948\u0964<br \/>\n\u0917\u094b\u0932\u0947 \u0915\u093e \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 4\u03c0r\u00b2<br \/>\n\u092a\u0930\u0928\u094d\u0924\u0941 \u092a\u094d\u0930\u0936\u094d\u0928 \u092e\u0947\u0902 \u0926\u093f\u092f\u093e \u0917\u092f\u093e \u0939\u0948 \u0915\u093f \u0917\u094b\u0932\u0947 \u0915\u093e \u092a\u0943\u0937\u094d\u0920 154 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940 \u0939\u0948\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm2.staticflickr.com\/1860\/44487481481_ab3ca5325d_o.png?resize=526%2C133&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.4 6\" width=\"526\" height=\"133\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.4 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 7.<\/strong><br \/>\n\u091a\u0928\u094d\u0926\u094d\u0930\u092e\u093e \u0915\u093e \u0935\u094d\u092f\u093e\u0938 \u092a\u0943\u0925\u094d\u0935\u0940 \u0915\u0947 \u0935\u094d\u092f\u093e\u0938 \u0915\u093e \u0932\u0917\u092d\u0917 \u090f\u0915-\u091a\u094c\u0925\u093e\u0908 \u0939\u0948\u0964 \u0907\u0928 \u0926\u094b\u0928\u094b\u0902 \u0915\u0947 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932\u094b\u0902 \u0915\u093e \u0905\u0928\u0941\u092a\u093e\u0924 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i1.wp.com\/farm2.staticflickr.com\/1852\/44438515002_1945028bab_o.png?resize=626%2C330&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.4 7\" width=\"626\" height=\"330\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.4 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 8.<\/strong><br \/>\n\u090f\u0915 \u0905\u0930\u094d\u0926\u094d\u0927\u0917\u094b\u0932\u093e\u0915\u093e\u0930 \u0915\u091f\u094b\u0930\u093e 0.5 \u0938\u0947\u092e\u0940 \u092e\u094b\u091f\u0940 \u0938\u094d\u091f\u0940\u0932 \u0938\u0947 \u092c\u0928\u093e \u0939\u0948\u0964 \u0907\u0938 \u0915\u091f\u094b\u0930\u0947 \u0915\u0940 \u0906\u0928\u094d\u0924\u0930\u093f\u0915 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e 5 \u0938\u0947\u092e\u0940 \u0939\u0948\u0964 \u0915\u091f\u094b\u0930\u0947 \u0915\u093e \u092c\u093e\u0939\u0930\u0940 \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i1.wp.com\/farm2.staticflickr.com\/1888\/44438515052_1e59bfd500_o.png?resize=669%2C239&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.4 8\" width=\"669\" height=\"239\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.4 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 9.<\/strong><br \/>\n\u0938\u0902\u0932\u0917\u094d\u0928 \u091a\u093f\u0924\u094d\u0930 \u092e\u0947\u0902, \u090f\u0915 \u0932\u092e\u094d\u092c\u0935\u0943\u0924\u094d\u0924\u0940\u092f \u092c\u0947\u0932\u0928 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e r \u0935\u093e\u0932\u0947 \u090f\u0915 \u0917\u094b\u0932\u0947 \u0915\u094b \u092a\u0942\u0930\u094d\u0923\u0924\u092f\u093e \u0918\u0947\u0930\u0947 \u0939\u0941\u090f \u0939\u0948\u0964 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n(i) \u0917\u094b\u0932\u0947 \u0915\u093e \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932<br \/>\n(ii) \u092c\u0947\u0932\u0928 \u0915\u093e \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932<br \/>\n(iii) \u090a\u092a\u0930 (i) \u0914\u0930 (ii) \u092e\u0947\u0902 \u092a\u094d\u0930\u093e\u092a\u094d\u0924 \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932\u094b\u0902 \u0915\u093e \u0905\u0928\u0941\u092a\u093e\u0924<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm2.staticflickr.com\/1844\/43578316015_c2ed0ace05_o.png?resize=105%2C122&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.4 9\" width=\"105\" height=\"122\" data-recalc-dims=\"1\" \/><br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u091a\u093f\u0924\u094d\u0930 \u092e\u0947\u0902 \u0932\u092e\u094d\u092c\u0935\u0943\u0924\u094d\u0924\u0940\u092f \u092c\u0947\u0932\u0928 \u0917\u094b\u0932\u0947 \u0915\u094b \u092a\u0942\u0930\u094d\u0923\u0924\u092f\u093e \u0918\u0947\u0930\u0947 \u0939\u0941\u090f \u0939\u0948\u0964<br \/>\n\u092c\u0947\u0932\u0928 \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e (R) = \u0917\u094b\u0932\u0947 \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e (r)<br \/>\n(i) \u0917\u094b\u0932\u0947 \u0915\u093e \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 4\u03c0r\u00b2<br \/>\n(ii) \u092c\u0947\u0932\u0928 \u0915\u093e \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 2\u03c0RH<br \/>\n\u091a\u093f\u0924\u094d\u0930 \u0938\u0947 \u0938\u094d\u092a\u0937\u094d\u091f \u0939\u0948 \u0915\u093f \u092c\u0947\u0932\u0928 \u0915\u0940 \u090a\u0901\u091a\u093e\u0908 H = 2r<br \/>\n\u092c\u0947\u0932\u0928 \u0915\u093e \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 2\u03c0R(2r)<br \/>\n\u092c\u0947\u0932\u0928 \u0915\u093e \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 2\u03c0R(2r) = 2\u03c0r (2r) = 4\u03c0r\u00b2 (\u2235 R = r)<br \/>\n\u0905\u0924\u0903 \u092c\u0947\u0932\u0928 \u0915\u093e \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 4\u03c0r\u00b2<br \/>\n(iii) \u0909\u0915\u094d\u0924 \u0926\u094b\u0928\u094b\u0902 \u0915\u0947 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932\u094b\u0902 \u092e\u0947\u0902 \u0905\u0928\u0941\u092a\u093e\u0924 = 4\u03c0r\u00b2 : 4\u03c0r\u00b2 = 1 : 1<\/p>\n<p style=\"text-align: center;\"><span style=\"color: #0000ff;\"><strong>\u092a\u094d\u0930\u0936\u094d\u0928\u093e\u0935\u0932\u0940 13.5<\/strong><\/span><\/p>\n<p><strong>Ex 13.5 Class 9 \u0917\u0923\u093f\u0924 \u092a\u094d\u0930\u0936\u094d\u0928 1.<\/strong><br \/>\n\u092e\u093e\u091a\u093f\u0938 \u0915\u0940 \u0921\u093f\u092c\u094d\u092c\u0940 \u0915\u0940 \u092e\u093e\u092a 4 \u0938\u0947\u092e\u0940 x 2.5 \u0938\u0947\u092e\u0940 x 1.5 \u0938\u0947\u092e\u0940 \u0939\u0948\u0902\u0964 \u0910\u0938\u0940 12 \u0921\u093f\u092c\u094d\u092c\u093f\u092f\u094b\u0902 \u0915\u0947 \u090f\u0915 \u092a\u0948\u0915\u0947\u091f \u0915\u093e \u0906\u092f\u0924\u0928 \u0915\u094d\u092f\u093e \u0939\u094b\u0917\u093e?<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u092e\u093e\u091a\u093f\u0938 \u0915\u0940 \u0921\u093f\u092c\u094d\u092c\u0940 \u0915\u0940 \u092e\u093e\u092a 4 \u0938\u0947\u092e\u0940 x 2.5 \u0938\u0947\u092e\u0940 x 1.5 \u0938\u0947\u092e\u0940 \u0939\u0948\u0964<br \/>\nl = 4 \u0938\u0947\u092e\u0940, b = 2.5 \u0938\u0947\u092e\u0940 \u0924\u0925\u093e h = 1.5 \u0938\u0947\u092e\u0940<br \/>\n\u092e\u093e\u091a\u093f\u0938 \u0915\u0940 \u0921\u093f\u092c\u094d\u092c\u0940 \u0915\u093e \u0906\u092f\u0924\u0928 = lbh = 4 x 2.5 x 1.5 = 15 \u0918\u0928 \u0938\u0947\u092e\u0940<br \/>\n\u0905\u0924\u0903 12 \u092e\u093e\u091a\u093f\u0938\u094b\u0902 \u0915\u0947 \u092a\u0948\u0915\u0947\u091f \u0915\u093e \u0906\u092f\u0924\u0928 = 15 x 12 = 180 \u0918\u0928 \u0938\u0947\u092e\u0940<\/p>\n<p><strong>Ex 13.5 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 2.<\/strong><br \/>\n\u090f\u0915 \u0918\u0928\u093e\u092d\u093e\u0915\u093e\u0930 \u092a\u093e\u0928\u0940 \u0915\u0940 \u091f\u0902\u0915\u0940 6 \u092e\u0940\u091f\u0930 \u0932\u092e\u094d\u092c\u0940, 5 \u092e\u0940\u091f\u0930 \u091a\u094c\u0921\u093c\u0940 \u0914\u0930 45 \u092e\u0940\u091f\u0930 \u0917\u0939\u0930\u0940 \u0939\u0948\u0964 \u0907\u0938\u092e\u0947\u0902 \u0915\u093f\u0924\u0928\u0947 \u0932\u0940\u091f\u0930 \u092a\u093e\u0928\u0940 \u0906 \u0938\u0915\u0924\u093e \u0939\u0948? (1 \u0918\u0928 \u092e\u0940\u091f\u0930 =1000 \u0932\u0940\u091f\u0930)<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u0926\u093f\u092f\u093e \u0939\u0948, \u0918\u0928\u093e\u092d\u093e\u0915\u093e\u0930 \u091f\u0902\u0915\u0940 \u0915\u0940 \u0932\u092e\u094d\u092c\u093e\u0908 (l) = 6 \u092e\u0940\u091f\u0930, \u091a\u094c\u0921\u093c\u093e\u0908 (b) = 5 \u092e\u0940\u091f\u0930 \u0914\u0930 \u0917\u0939\u0930\u093e\u0908 (h) = 4.5 \u092e\u0940\u091f\u0930\u0964<br \/>\n\u091f\u0902\u0915\u0940 \u0915\u093e \u0906\u092f\u0924\u0928 = lbh = 6 x 5 x 4.5 = 135 \u0918\u0928 \u092e\u0940\u091f\u0930<br \/>\n\u091f\u0902\u0915\u0940 \u092e\u0947\u0902 \u0938\u092e\u093e\u0939\u093f\u0924 \u0939\u094b \u0938\u0915\u0928\u0947 \u0935\u093e\u0932\u0947 \u092a\u093e\u0928\u0940 \u0915\u093e \u0906\u092f\u0924\u0928 = 135 \u0918\u0928 \u092e\u0940\u091f\u0930 = 135 x 1000 \u0932\u0940\u091f\u0930 = 1,35,000 \u0932\u0940\u091f\u0930 (1 \u0918\u0928 \u092e\u0940\u091f\u0930 = 1000 \u0932\u0940\u091f\u0930)<br \/>\n\u0905\u0924\u0903 \u091f\u0902\u0915\u0940 \u092e\u0947\u0902 135,000 \u0932\u0940\u091f\u0930 \u092a\u093e\u0928\u0940 \u0906 \u0938\u0915\u0924\u093e \u0939\u0948\u0964<\/p>\n<p><strong>Ex 13.5 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 3.<\/strong><br \/>\n\u090f\u0915 \u0918\u0928\u093e\u092d\u093e\u0915\u093e\u0930 \u092c\u0930\u094d\u0924\u0928 10 \u092e\u0940\u091f\u0930 \u0932\u092e\u094d\u092c\u093e \u0914\u0930 8 \u092e\u0940\u091f\u0930 \u091a\u094c\u0921\u093c\u093e \u0939\u0948\u0964 \u0907\u0938\u0915\u094b \u0915\u093f\u0924\u0928\u093e \u090a\u0901\u091a\u093e \u092c\u0928\u093e\u092f\u093e \u091c\u093e\u090f \u0915\u093f \u0907\u0938\u092e\u0947\u0902 380 \u0918\u0928 \u092e\u0940\u091f\u0930 \u0926\u094d\u0930\u0935 \u0906 \u0938\u0915\u0947?<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u092e\u093e\u0928\u093e \u092c\u0930\u094d\u0924\u0928 h \u092e\u0940\u091f\u0930 \u090a\u0901\u091a\u093e \u092c\u0928\u093e\u092f\u093e \u091c\u093e\u090f\u0964<br \/>\n\u0926\u093f\u092f\u093e \u0939\u0948, \u0918\u0928\u093e\u092d\u093e\u0915\u093e\u0930 \u092c\u0930\u094d\u0924\u0928 \u0915\u0940 \u0932\u092e\u094d\u092c\u093e\u0908 (l) = 10 \u092e\u0940\u091f\u0930<br \/>\n\u0914\u0930 \u091a\u094c\u0921\u093c\u093e\u0908 (b) = 8 \u092e\u0940\u091f\u0930<br \/>\n\u0918\u0928\u093e\u092d\u093e\u0915\u093e\u0930 \u092c\u0930\u094d\u0924\u0928 \u0915\u093e \u0906\u092f\u0924\u0928 = lbh = 10 x 8 x h = 80 h \u0918\u0928 \u092e\u0940\u091f\u0930<br \/>\n\u092a\u094d\u0930\u0936\u094d\u0928\u093e\u0928\u0941\u0938\u093e\u0930, \u092c\u0930\u094d\u0924\u0928 \u092e\u0947\u0902 \u0938\u092e\u093e \u0938\u0915\u0928\u0947 \u0935\u093e\u0932\u0947 \u0926\u094d\u0930\u0935 \u0915\u093e \u0906\u092f\u0924\u0928 380 \u0918\u0928 \u092e\u0940\u091f\u0930 \u0939\u0948\u0964<br \/>\n80 h = 380 \u21d2 h = 4.75 \u092e\u0940\u091f\u0930<br \/>\n\u0905\u0924\u0903 \u092c\u0930\u094d\u0924\u0928 \u0915\u0940 \u090a\u0901\u091a\u093e\u0908 = 4.75 \u092e\u0940\u091f\u0930<\/p>\n<p><strong>Ex 13.5 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 4.<\/strong><br \/>\n8 \u092e\u0940\u091f\u0930 \u0932\u092e\u094d\u092c\u093e, 6 \u092e\u0940\u091f\u0930 \u091a\u094c\u0921\u093c\u093e \u0914\u0930 3 \u092e\u0940\u091f\u0930 \u0917\u0939\u0930\u093e \u090f\u0915 \u0918\u0928\u093e\u092d\u093e\u0915\u093e\u0930 \u0917\u0926\u094d\u092c\u093e \u0916\u0941\u0926\u0935\u093e\u0928\u0947 \u092e\u0947\u0902 \u20b9 30 \u092a\u094d\u0930\u0924\u093f \u0918\u0928 \u092e\u0940\u091f\u0930 \u0915\u0940 \u0926\u0930 \u0938\u0947 \u0939\u094b\u0928\u0947 \u0935\u093e\u0932\u093e \u0935\u094d\u092f\u092f \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u0926\u093f\u092f\u093e \u0939\u0948, \u0918\u0928\u093e\u092d\u093e\u0915\u093e\u0930 \u0917\u091f\u094d\u091f\u0947 \u0915\u0940 \u0932\u092e\u094d\u092c\u093e\u0908 (l) = 8 \u092e\u0940\u091f\u0930, \u091a\u094c\u0921\u093c\u093e\u0908 (b) = 6 \u092e\u0940\u091f\u0930 \u0924\u0925\u093e \u0917\u0939\u0930\u093e\u0908 (h) = 3 \u092e\u0940\u091f\u0930<br \/>\n\u0917\u0932\u094d\u0932\u0947 \u0915\u093e \u0906\u092f\u0924\u0928 = lbh = 8 x 6 x 3 = 144 \u0918\u0928 \u092e\u0940\u091f\u0930<br \/>\n1 \u0918\u0928 \u092e\u0940\u091f\u0930 \u0917\u0921\u094d\u0922\u093e \u0916\u0941\u0926\u0935\u093e\u0928\u0947 \u0915\u093e \u0935\u094d\u092f\u092f = \u20b9 30<br \/>\n144 \u0918\u0928 \u092e\u0940\u091f\u0930 \u0917\u0921\u094d\u0922\u093e \u0916\u0941\u0926\u0935\u093e\u0928\u0947 \u0915\u093e \u0935\u094d\u092f\u092f\u0947 = 30 x 144 = \u20b9 4320<br \/>\n\u0905\u0924\u0903 \u0917\u0926\u094d\u092c\u093e \u0916\u0941\u0926\u0935\u093e\u0928\u0947 \u092e\u0947\u0902 \u0939\u094b\u0928\u0947 \u0935\u093e\u0932\u093e \u0935\u094d\u092f\u092f = \u20b9 4320<\/p>\n<p><strong>Ex 13.5 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 5.<\/strong><br \/>\n\u090f\u0915 \u0918\u0928\u093e\u092d\u093e\u0915\u093e\u0930 \u092a\u093e\u0928\u0940 \u0915\u0940 \u091f\u0902\u0915\u0940 \u0915\u0940 \u0927\u093e\u0930\u093f\u0924\u093e 50,000 \u0932\u0940\u091f\u0930 \u092a\u093e\u0928\u0940 \u0915\u0940 \u0939\u0948\u0964 \u092f\u0926\u093f \u0907\u0938 \u091f\u0902\u0915\u0940 \u0915\u0940 \u0932\u092e\u094d\u092c\u093e\u0908 \u0914\u0930 \u0917\u0939\u0930\u093e\u0908 \u0915\u094d\u0930\u092e\u0936\u0903 2.5 \u092e\u0940\u091f\u0930 \u0914\u0930 10 \u092e\u0940\u091f\u0930 \u0939\u0948 \u0924\u094b \u0907\u0938\u0915\u0940 \u091a\u094c\u0921\u093c\u093e\u0908 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u092e\u093e\u0928\u093e \u091f\u0902\u0915\u0940 \u0915\u0940 \u091a\u094c\u0921\u093c\u093e\u0908 5 \u092e\u0940\u091f\u0930 \u0939\u0948\u0964<br \/>\n\u0926\u093f\u092f\u093e \u0939\u0948, \u091f\u0902\u0915\u0940 \u0915\u0940 \u0932\u092e\u094d\u092c\u093e\u0908 (l) = 2.5 \u092e\u0940\u091f\u0930<br \/>\n\u0914\u0930 \u091f\u0902\u0915\u0940 \u0915\u0940 \u0917\u0939\u0930\u093e\u0908 (h) = 10 \u092e\u0940\u091f\u0930\u0964<br \/>\n\u0918\u0928\u093e\u092d\u093e\u0915\u093e\u0930 \u091f\u0902\u0915\u0940 \u0915\u093e \u0906\u092f\u0924\u0928 = lbh = 2.5 x b x 10 = 25b \u0918\u0928 \u092e\u0940\u091f\u0930<br \/>\n\u091f\u0902\u0915\u0940 \u0915\u0940 \u0927\u093e\u0930\u093f\u0924\u093e = \u0918\u0928\u093e\u092d\u093e\u0915\u093e\u0930 \u091f\u0902\u0915\u0940 \u0915\u093e \u0906\u092f\u0924\u0928 = 25b \u0918\u0928 \u092e\u0940\u091f\u0930<br \/>\n= 25b x 1000 \u0932\u0940\u091f\u0930 (1 \u0918\u0928 \u092e\u0940\u091f\u0930 = 1000 \u0932\u0940\u091f\u0930) = 25,000b \u0932\u0940\u091f\u0930\u0964<br \/>\n\u092a\u0930\u0928\u094d\u0924\u0941 \u092a\u094d\u0930\u0936\u094d\u0928 \u092e\u0947\u0902 \u0926\u093f\u092f\u093e \u0917\u092f\u093e \u0939\u0948 \u0915\u093f \u091f\u0902\u0915\u0940 \u0915\u0940 \u0927\u093e\u0930\u093f\u0924\u093e 50,000 \u0932\u0940\u091f\u0930 \u0939\u0948\u0964<br \/>\n25,000 b = 50,000 \u21d2 b = 2 \u092e\u0940\u091f\u0930<br \/>\n\u0905\u0924\u0903 \u091f\u0902\u0915\u0940 \u0915\u0940 \u091a\u094c\u0921\u093c\u093e\u0908 = 2 \u092e\u0940\u091f\u0930<\/p>\n<p><strong>Ex 13.5 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 6.<\/strong><br \/>\n\u090f\u0915 \u0917\u093e\u0901\u0935 \u091c\u093f\u0938\u0915\u0940 \u091c\u0928\u0938\u0902\u0916\u094d\u092f\u093e 4000 \u0939\u0948, \u0915\u094b \u092a\u094d\u0930\u0924\u093f\u0926\u093f\u0928 \u092a\u094d\u0930\u0924\u093f \u0935\u094d\u092f\u0915\u094d\u0924\u093f 150 \u0932\u0940\u091f\u0930 \u092a\u093e\u0928\u0940 \u0915\u0940 \u0906\u0935\u0936\u094d\u092f\u0915\u0924\u093e \u0939\u0948\u0964 \u0907\u0938 \u0917\u093e\u0901\u0935 \u092e\u0947\u0902 20 \u092e\u0940\u091f\u0930 x 15 \u092e\u0940\u091f\u0930 x 6 \u092e\u0940\u091f\u0930 \u092e\u093e\u092a\u094b\u0902 \u0935\u093e\u0932\u0940 \u090f\u0915 \u091f\u0902\u0915\u0940 \u092c\u0928\u0940 \u0939\u0941\u0908 \u0939\u0948\u0964 \u0907\u0938 \u091f\u0902\u0915\u0940 \u0915\u093e \u092a\u093e\u0928\u0940 \u0935\u0939\u093e\u0901 \u0915\u093f\u0924\u0928\u0947 \u0926\u093f\u0928 \u0915\u0947 \u0932\u093f\u090f \u092a\u0930\u094d\u092f\u093e\u092a\u094d\u0924 \u0939\u094b\u0917\u093e?<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u0926\u093f\u092f\u093e \u0939\u0948, \u0917\u093e\u0901\u0935 \u0915\u0940 \u091c\u0928\u0938\u0902\u0916\u094d\u092f\u093e = 4000<br \/>\n\u092a\u094d\u0930\u0924\u093f \u0935\u094d\u092f\u0915\u094d\u0924\u093f \u092a\u094d\u0930\u0924\u093f\u0926\u093f\u0928 \u092a\u093e\u0928\u0940 \u0915\u0940 \u0906\u0935\u0936\u094d\u092f\u0915\u0924\u093e = 150 \u0932\u0940\u091f\u0930<br \/>\n\u092a\u094d\u0930\u0924\u093f\u0926\u093f\u0928 \u0917\u093e\u0901\u0935 \u0915\u0947 \u0932\u093f\u090f \u0906\u0935\u0936\u094d\u092f\u0915 \u092a\u093e\u0928\u0940 \u0915\u0940 \u092e\u093e\u0924\u094d\u0930\u093e = 4000 x 150 \u0932\u0940\u091f\u0930 = 6,00,000 \u0932\u0940\u091f\u0930 = 600 \u0918\u0928 \u092e\u0940\u091f\u0930 (1000 \u0932\u0940\u091f\u0930 = 1 \u0918\u0928 \u092e\u0940\u091f\u0930)<br \/>\n\u091f\u0902\u0915\u0940 \u0915\u093e \u0906\u092f\u0924\u0928 = l x b x h = 20 x 15 x 6 = 1800 \u0918\u0928 \u092e\u0940\u091f\u0930<br \/>\n\u0905\u0924\u0903 \u092a\u093e\u0928\u0940 \u0938\u0947 \u092d\u0930\u0940 \u091f\u0902\u0915\u0940 \u0917\u093e\u0901\u0935 \u0915\u0947 \u0932\u093f\u090f \\(\\frac { 1800 }{ 600 }\\) = 3 \u0926\u093f\u0928 \u0915\u0947 \u0932\u093f\u090f \u092a\u0930\u094d\u092f\u093e\u092a\u094d\u0924 \u0939\u094b\u0917\u0940\u0964<\/p>\n<p><strong>Ex 13.5 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 7.<\/strong><br \/>\n\u0915\u093f\u0938\u0940 \u0917\u094b\u0926\u093e\u092e \u0915\u0940 \u092e\u093e\u092a\u0947\u0902 40 \u092e\u0940\u091f\u0930 x 25 \u092e\u0940\u091f\u0930 x 10 \u092e\u0940\u091f\u0930 \u0939\u0948\u0902\u0964 \u0907\u0938 \u0917\u094b\u0926\u093e\u092e \u092e\u0947\u0902 1.5 \u092e\u0940\u091f\u0930 x 1.25 \u092e\u0940\u091f\u0930 x 0.5 \u092e\u0940\u091f\u0930 \u0915\u0940 \u092e\u093e\u092a \u0935\u093e\u0932\u0947 \u0932\u0915\u0921\u093c\u0940 \u0915\u0947 \u0915\u093f\u0924\u0928\u0947 \u0905\u0927\u093f\u0915\u0924\u092e \u0915\u094d\u0930\u0947\u091f (crate) \u0930\u0916\u0947 \u091c\u093e \u0938\u0915\u0924\u0947 \u0939\u0948\u0902?<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u092e\u093e\u0928\u093e \u0932\u0915\u0921\u093c\u0940 \u0915\u0947 n \u0915\u094d\u0930\u0947\u091f \u0930\u0916\u0947 \u091c\u093e \u0938\u0915\u0924\u0947 \u0939\u0948\u0902\u0964<br \/>\n\u092a\u094d\u0930\u0924\u094d\u092f\u0947\u0915 \u0915\u094d\u0930\u0947\u091f \u0915\u0940 \u092e\u093e\u092a 1.5 \u092e\u0940\u091f\u0930 x 1.25 \u092e\u0940\u091f\u0930 x 0.5 \u092e\u0940\u091f\u0930 \u0939\u0948\u0964<br \/>\n\u092a\u094d\u0930\u0924\u094d\u092f\u0947\u0915 \u0915\u094d\u0930\u0947\u091f \u0915\u093e \u0906\u092f\u0924\u0928 = 1.5 x 125 x 0.5 = 0.9375 \u0918\u0928 \u092e\u0940\u091f\u0930<br \/>\n\u0938\u092d\u0940 n \u0915\u094d\u0930\u0947\u091f\u094d\u0938 \u0915\u093e \u0906\u092f\u0924\u0928 = 09375 n \u0918\u0928 \u092e\u0940\u091f\u0930\u0964<br \/>\n\u0917\u094b\u0926\u093e\u092e \u0915\u093e \u0906\u092f\u0924\u0928 = 40 \u092e\u0940\u091f\u0930 x 25 \u092e\u0940\u091f\u0930 x 10 \u092e\u0940\u091f\u0930 = 10,000 \u0918\u0928 \u092e\u0940\u091f\u0930<br \/>\n\u0917\u094b\u0926\u093e\u092e \u0915\u093e \u0906\u092f\u0924\u0928 \u0932\u0915\u0921\u093c\u0940 \u0915\u0947 n \u0915\u094d\u0930\u0947\u091f\u094d\u0938 \u0915\u0947 \u0906\u092f\u0924\u0928 \u0915\u0947 \u092c\u0930\u093e\u092c\u0930 \u0939\u094b\u0928\u093e \u091a\u093e\u0939\u093f\u090f\u0964<br \/>\n0.9375 n = 10,000 \u21d2 n = \\(\\frac { 10000 }{ 0.9375 }\\) = 10666<br \/>\n\u0905\u0924: \u0917\u094b\u0926\u093e\u092e \u092e\u0947\u0902 10666 \u0915\u094d\u0930\u0947\u091f\u094d\u0938 \u0930\u0916\u0947 \u091c\u093e \u0938\u0915\u0924\u0947 \u0939\u0948\u0902\u0964<\/p>\n<p><strong>Ex 13.5 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 8.<\/strong><br \/>\n12 \u0938\u0947\u092e\u0940 \u092d\u0941\u091c\u093e \u0935\u093e\u0932\u0947 \u090f\u0915 \u0920\u094b\u0938 \u0918\u0928 \u0915\u094b \u092c\u0930\u093e\u092c\u0930 \u0906\u092f\u0924\u0928 \u0935\u093e\u0932\u0947 8 \u0918\u0928\u094b\u0902 \u092e\u0947\u0902 \u0915\u093e\u091f\u093e \u091c\u093e\u0924\u093e \u0939\u0948\u0964 \u0928\u090f \u0918\u0928 \u0915\u0940 \u092d\u0941\u091c\u093e \u0915\u094d\u092f\u093e \u0939\u094b\u0917\u0940? \u0938\u093e\u0925 \u0939\u0940, \u0907\u0928 \u0926\u094b\u0928\u094b\u0902 \u0918\u0928\u094b\u0902 \u0915\u0947 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932\u094b\u0902 \u0915\u093e \u0905\u0928\u0941\u092a\u093e\u0924 \u092d\u0940 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n12 \u0938\u0947\u092e\u0940 \u092d\u0941\u091c\u093e \u0935\u093e\u0932\u0947 \u0920\u094b\u0938 \u0918\u0928 \u0915\u093e \u0906\u092f\u0924\u0928 = (12)<sup>3<\/sup> = 12 x 12 x 12 = 1728 \u0918\u0928 \u0938\u0947\u092e\u0940<br \/>\n\u0907\u0938 \u0918\u0928\u0947 \u0915\u094b 8 \u0938\u092e\u093e\u0928 \u0906\u092f\u0924\u0928 \u0935\u093e\u0932\u0947 \u0918\u0928\u094b\u0902 \u092e\u0947\u0902 \u0915\u093e\u091f\u093e \u091c\u093e\u0924\u093e \u0939\u0948\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm2.staticflickr.com\/1851\/43578316115_25af0c6ef4_o.png?resize=619%2C266&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.5 8\" width=\"619\" height=\"266\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.5 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 9.<\/strong><br \/>\n3 \u092e\u0940\u091f\u0930 \u0917\u0939\u0930\u0940 \u0914\u0930 40 \u092e\u0940\u091f\u0930 \u091a\u094c\u0921\u093c\u0940 \u090f\u0915 \u0928\u0926\u0940 2 \u0915\u093f\u092e\u0940 \u092a\u094d\u0930\u0924\u093f \u0918\u0923\u094d\u091f\u093e \u0915\u0940 \u091a\u093e\u0932 \u0938\u0947 \u092c\u0939\u0915\u0930 \u0938\u092e\u0941\u0926\u094d\u0930 \u092e\u0947\u0902 \u0917\u093f\u0930\u0924\u0940 \u0939\u0948\u0964 \u090f\u0915 \u092e\u093f\u0928\u091f \u092e\u0947\u0902 \u0938\u092e\u0941\u0926\u094d\u0930 \u092e\u0947\u0902 \u0915\u093f\u0924\u0928\u093e \u092a\u093e\u0928\u0940 \u0917\u093f\u0930\u0947\u0917\u093e?<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u0926\u093f\u092f\u093e \u0939\u0948, \u0928\u0926\u0940 \u0915\u0940 \u0917\u0939\u0930\u093e\u0908 = 3 \u092e\u0940\u091f\u0930 \u0914\u0930 \u091a\u094c\u0921\u093c\u093e\u0908 = 40 \u092e\u0940\u091f\u0930<br \/>\n\u0928\u0926\u0940 \u0915\u093e \u092a\u0930\u093f\u091a\u094d\u091b\u0947\u0926 \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 (sectional area) = 3 x 40 = 120 \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930<br \/>\n\u0928\u0926\u0940 \u0915\u0947 \u092a\u093e\u0928\u0940 \u0915\u0940 \u091a\u093e\u0932 2 \u0915\u093f\u092e\u0940 \u092a\u094d\u0930\u0924\u093f \u0918\u0923\u094d\u091f\u093e \u0939\u0948\u0964<br \/>\n1 \u092e\u093f\u0928\u091f \u092e\u0947\u0902 \u0928\u0926\u0940 \u0915\u0947 \u0935\u093f\u0938\u094d\u0925\u093e\u092a\u093f\u0924 \u092a\u093e\u0928\u0940 \u0915\u0940 \u0932\u092e\u094d\u092c\u093e\u0908 = \\(\\frac { 2 x 1000 }{ 60 }\\) = \\(\\frac { 100 }{ 3 }\\) \u092e\u0940\u091f\u0930<br \/>\n1 \u092e\u093f\u0928\u091f \u092e\u0947\u0902 \u0938\u092e\u0941\u0926\u094d\u0930 \u092e\u0947\u0902 \u0917\u093f\u0930\u0928\u0947 \u0935\u093e\u0932\u0947 \u092a\u093e\u0928\u0940 \u0915\u093e \u0906\u092f\u0924\u0928 = 1 \u092e\u093f\u0928\u091f \u092e\u0947\u0902 \u0935\u093f\u0938\u094d\u0925\u093e\u092a\u093f\u0924 \u092a\u093e\u0928\u0940 \u0915\u0940 \u0932\u092e\u094d\u092c\u093e\u0908 x \u0928\u0926\u0940 \u0915\u093e \u092a\u0930\u093f\u091a\u094d\u091b\u0947\u0926 \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932<br \/>\n= \\(\\frac { 100 }{ 3 }\\) x 120 = 4000 \u0918\u0928 \u092e\u0940\u091f\u0930<br \/>\n\u0905\u0924: 1 \u092e\u093f\u0928\u091f \u092e\u0947\u0902 \u0938\u092e\u0941\u0926\u094d\u0930 \u092e\u0947\u0902 4000 \u0932\u0940\u091f\u0930 \u092a\u093e\u0928\u0940 \u0917\u093f\u0930\u0947\u0917\u093e\u0964<\/p>\n<p style=\"text-align: center;\"><strong>\u092a\u094d\u0930\u0936\u094d\u0928\u093e\u0935\u0932\u0940 13.6<\/strong><\/p>\n<p><strong>\u091c\u092c \u0924\u0915 \u0905\u0928\u094d\u092f\u0925\u093e \u0928 \u0915\u0939\u093e \u091c\u093e\u090f \u03c0 = \\(\\frac { 22 }{ 7 }\\) \u0932\u0940\u091c\u093f\u090f\u0964<\/strong><br \/>\n<strong>Ex 13.6 Class 9 \u0917\u0923\u093f\u0924 \u092a\u094d\u0930\u0936\u094d\u0928 1.<\/strong><br \/>\n\u090f\u0915 \u092c\u0947\u0932\u0928\u093e\u0915\u093e\u0930 \u092c\u0930\u094d\u0924\u0928 \u0915\u0947 \u0906\u0927\u093e\u0930 \u0915\u0940 \u092a\u0930\u093f\u0927\u093f 132 \u0938\u0947\u092e\u0940 \u0914\u0930 \u0909\u0938\u0915\u0940 \u090a\u0901\u091a\u093e\u0908 25 \u0938\u0947\u092e\u0940 \u0939\u0948\u0964 \u0907\u0938 \u092c\u0930\u094d\u0924\u0928 \u092e\u0947\u0902 \u0915\u093f\u0924\u0928\u0947 \u0932\u0940\u091f\u0930 \u092a\u093e\u0928\u0940 \u0906 \u0938\u0915\u0924\u093e \u0939\u0948? (1000 \u0938\u0947\u092e\u0940<sup>3<\/sup> = 1 \u0932\u0940\u091f\u0930)<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm2.staticflickr.com\/1856\/44438515312_15c7fdd996_o.png?resize=668%2C361&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.6 1\" width=\"668\" height=\"361\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.6 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 2.<\/strong><br \/>\n\u090f\u0915 \u0932\u0915\u0921\u093c\u0940 \u0915\u0947 \u092c\u0947\u0932\u0928\u093e\u0915\u093e\u0930 \u092a\u093e\u0907\u092a \u0915\u093e \u0906\u0928\u094d\u0924\u0930\u093f\u0915 \u0935\u094d\u092f\u093e\u0938 24 \u0938\u0947\u092e\u0940 \u0939\u0948 \u0914\u0930 \u092c\u093e\u0939\u0930\u0940 \u0935\u094d\u092f\u093e\u0938 28 \u0938\u0947\u092e\u0940 \u0939\u0948\u0964 \u0907\u0938 \u092a\u093e\u0907\u092a \u0915\u0940 \u0932\u092e\u094d\u092c\u093e\u0908 35 \u0938\u0947\u092e\u0940 \u0939\u0948\u0964 \u0907\u0938 \u092a\u093e\u0907\u092a \u0915\u093e \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f \u092f\u0926\u093f 1 \u0938\u0947\u092e\u0940 \u0932\u0915\u0921\u093c\u0940 \u0915\u093e \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 0.6 \u0917\u094d\u0930\u093e\u092e \u0939\u0948\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i1.wp.com\/farm2.staticflickr.com\/1875\/44487482141_177a4692b3_o.png?resize=672%2C605&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.6 2\" width=\"672\" height=\"605\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.6 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 3.<\/strong><br \/>\n\u090f\u0915 \u0938\u094b\u092b\u094d\u091f \u0921\u094d\u0930\u093f\u0902\u0915 (soft drink) \u0926\u094b \u092a\u094d\u0930\u0915\u093e\u0930 \u0915\u0947 \u092a\u0948\u0915\u094b\u0902 \u092e\u0947\u0902 \u0909\u092a\u0932\u092c\u094d\u0927 \u0939\u0948 :<br \/>\n(i) \u0932\u092e\u094d\u092c\u093e\u0908 5 \u0938\u0947\u092e\u0940 \u0914\u0930 \u091a\u094c\u0921\u093c\u093e\u0908 4 \u0938\u0947\u092e\u0940 \u0935\u093e\u0932\u0947 \u090f\u0915 \u0906\u092f\u0924\u093e\u0915\u093e\u0930 \u0906\u0927\u093e\u0930 \u0915\u093e \u091f\u093f\u0928 \u0915\u093e \u0921\u093f\u092c\u094d\u092c\u093e \u091c\u093f\u0938\u0915\u0940 \u090a\u0901\u091a\u093e\u0908 15 \u0938\u0947\u092e\u0940 \u0939\u0948 \u0914\u0930<br \/>\n(ii) \u0935\u094d\u092f\u093e\u0938 7 \u0938\u0947\u092e\u0940 \u0935\u093e\u0932\u0947 \u0935\u0943\u0924\u094d\u0924\u0940\u092f \u0906\u0927\u093e\u0930 \u0914\u0930 10 \u0938\u0947\u092e\u0940 \u090a\u0901\u091a\u093e\u0908 \u0935\u093e\u0932\u093e \u090f\u0915 \u092a\u094d\u0932\u093e\u0938\u094d\u091f\u093f\u0915 \u0915\u093e \u092c\u0947\u0932\u0928\u093e\u0915\u093e\u0930 \u0921\u093f\u092c\u094d\u092c\u093e\u0964<br \/>\n\u0915\u093f\u0938 \u0921\u093f\u092c\u094d\u092c\u0947 \u0915\u0940 \u0927\u093e\u0930\u093f\u0924\u093e \u0905\u0927\u093f\u0915 \u0939\u0948 \u0914\u0930 \u0915\u093f\u0924\u0928\u0940 \u0905\u0927\u093f\u0915 \u0939\u0948?<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u0926\u093f\u092f\u093e \u0939\u0948, \u091f\u093f\u0928 \u0915\u0947 \u0921\u093f\u092c\u094d\u092c\u0947 \u0915\u0940 \u0932\u092e\u094d\u092c\u093e\u0908 (l) = 5 \u0938\u0947\u092e\u0940<br \/>\n\u091a\u094c\u0921\u093c\u093e\u0908 (b) = 4 \u0938\u0947\u092e\u0940<br \/>\n\u0914\u0930 \u090a\u0901\u091a\u093e\u0908 (h) = 15 \u0938\u0947\u092e\u0940<br \/>\n\u091f\u0940\u0928 \u0915\u0947 \u0921\u093f\u092c\u094d\u092c\u0947 \u0915\u0940 \u0927\u093e\u0930\u093f\u0924\u093e = lbh = 5 x 4 x 15 = 300 \u0918\u0928 \u0938\u0947\u092e\u0940<br \/>\n\u0935\u0943\u0924\u094d\u0924\u0940\u092f \u0906\u0927\u093e\u0930 \u0935\u093e\u0932\u0947 \u0921\u093f\u092c\u094d\u092c\u0947 \u0915\u093e \u0935\u094d\u092f\u093e\u0938 = 7 \u0938\u0947\u092e\u0940<br \/>\n\u0935\u0943\u0924\u094d\u0924\u0940\u092f \u0906\u0927\u093e\u0930 \u0935\u093e\u0932\u0947 \u0921\u093f\u092c\u094d\u092c\u0947 \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e (r) = \\(\\frac { 7 }{ 2 }\\) \u0938\u0947\u092e\u0940<br \/>\n\u0914\u0930 \u0921\u093f\u092c\u094d\u092c\u0947 \u0915\u0940 \u090a\u0901\u091a\u093e\u0908 (h&#8217;) = 10 \u0938\u0947\u092e\u0940<br \/>\n\u092c\u0947\u0932\u0928\u093e\u0915\u093e\u0930 \u0921\u093f\u092c\u094d\u092c\u0947 \u0915\u0940 \u0927\u093e\u0930\u093f\u0924\u093e = \u03c0r\u00b2h&#8217; = \\(\\frac { 22 }{ 7 }\\) x \\(\\frac { 7 }{ 2 }\\) x \\(\\frac { 7 }{ 2 }\\) x 10 \u0918\u0928 \u0938\u0947\u092e\u0940 = 385 \u0918\u0928 \u0938\u0947\u092e\u0940<br \/>\n\u0905\u0924\u0903 \u0938\u094d\u092a\u0937\u094d\u091f \u0939\u0948 \u0915\u093f \u092c\u0947\u0932\u0928\u093e\u0915\u093e\u0930 \u0921\u093f\u092c\u094d\u092c\u0947 \u0915\u0940 \u0927\u093e\u0930\u093f\u0924\u093e 85 \u0918\u0928 \u0938\u0947\u092e\u0940 \u0905\u0927\u093f\u0915 \u0939\u0948\u0964<\/p>\n<p><strong>Ex 13.6 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 4.<\/strong><br \/>\n\u092f\u0926\u093f \u090f\u0915 \u092c\u0947\u0932\u0928 \u0915\u093e \u092a\u093e\u0936\u094d\u0930\u094d\u0935 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 94.2 \u0938\u0947\u092e\u0940 \u0939\u0948 \u0914\u0930 \u0909\u0938\u0915\u0940 \u090a\u0901\u091a\u093e\u0908\u0964 5 \u0938\u0947\u092e\u0940 \u0939\u0948 \u0924\u094b \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f:<br \/>\n(i) \u0906\u0927\u093e\u0930 \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e,<br \/>\n(ii) \u092c\u0947\u0932\u0928 \u0915\u093e \u0906\u092f\u0924\u0928 (\u03c0 = 3.14 \u0932\u0940\u091c\u093f\u090f)<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n(i) \u092e\u093e\u0928\u093e \u092c\u0947\u0932\u0928 \u0915\u0947 \u0906\u0927\u093e\u0930 \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e r \u0938\u0947\u092e\u0940 \u0939\u0948\u0964<br \/>\n\u0926\u093f\u092f\u093e \u0939\u0948, \u092c\u0947\u0932\u0928 \u0915\u0940 \u090a\u0901\u091a\u093e\u0908 (h) = 5 \u0938\u0947\u092e\u0940<br \/>\n\u092c\u0947\u0932\u0928 \u0915\u093e \u092a\u093e\u0930\u094d\u0936\u094d\u0935 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 2\u03c0rh = 2 x 3.14 x r x 5 = 314 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n\u092a\u0930\u0928\u094d\u0924\u0941 \u092a\u094d\u0930\u0936\u094d\u0928 \u092e\u0947\u0902 \u0926\u093f\u092f\u093e \u0917\u092f\u093e \u0939\u0948 \u0915\u093f \u092c\u0947\u0932\u0928 \u0915\u093e \u092a\u093e\u0930\u094d\u0936\u094d\u0935 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 94.2 \u0938\u0947\u092e\u0940 \u0939\u0948\u0964<br \/>\n31.4r = 94.2 \u21d2 r = 3 \u0938\u0947\u092e\u0940<br \/>\n\u0905\u0924\u0903 \u092c\u0947\u0932\u0928 \u0915\u0947 \u0906\u0927\u093e\u0930 \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e = 3 \u0938\u0947\u092e\u0940<br \/>\n(ii) \u0926\u093f\u092f\u093e \u0939\u0948, \u092c\u0947\u0932\u0928 \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e (r) = 3 \u0938\u0947\u0902\u092e\u0940 \u0924\u0925\u093e \u092c\u0947\u0932\u0928 \u0915\u0940 \u090a\u0901\u091a\u093e\u0908 (h) = 5 \u0938\u0947\u092e\u0940<br \/>\n\u092c\u0947\u0932\u0928 \u0915\u093e \u0906\u092f\u0924\u0928 = \u03c0r\u00b2h = 3.14 x 3 x 3 x 5 = 3.14 x 45 = 1413 \u0918\u0928 \u0938\u0947\u092e\u0940<br \/>\n\u0905\u0924\u0903 \u092c\u0947\u0932\u0928 \u0915\u093e \u0906\u092f\u0924\u0928 = 141.3 \u0918\u0928 \u0938\u0947\u092e\u0940<\/p>\n<p><strong>Ex 13.6 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 5.<\/strong><br \/>\n10 \u092e\u0940\u091f\u0930 \u0917\u0939\u0930\u0947 \u090f\u0915 \u092c\u0947\u0932\u0928\u093e\u0915\u093e\u0930 \u092c\u0930\u094d\u0924\u0928 \u0915\u0947 \u0906\u0928\u094d\u0924\u0930\u093f\u0915 \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920 \u0915\u094b \u092a\u0947\u0902\u091f \u0915\u0930\u093e\u0928\u0947 \u0915\u093e \u0935\u094d\u092f\u092f \u20b9 2200 \u0939\u0948\u0964 \u092f\u0926\u093f \u092a\u0947\u0902\u091f \u0915\u0930\u093e\u0928\u0947 \u0915\u0940 \u0926\u0930 \u20b9 20 \u092a\u094d\u0930\u0924\u093f \u092e\u0940\u091f\u0930\u00b2 \u0939\u0948, \u0924\u094b \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f:<br \/>\n(i) \u092c\u0930\u094d\u0924\u0928 \u0915\u094b \u0906\u0928\u094d\u0924\u0930\u093f\u0915 \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932<br \/>\n(ii) \u0906\u0927\u093e\u0930 \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e<br \/>\n(iii) \u092c\u0930\u094d\u0924\u0928 \u0915\u0940 \u0927\u093e\u0930\u093f\u0924\u093e<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm2.staticflickr.com\/1865\/43578316545_388180829f_o.png?resize=591%2C478&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.6 5\" width=\"591\" height=\"478\" data-recalc-dims=\"1\" \/><br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm2.staticflickr.com\/1888\/43578316325_b210c950e4_o.png?resize=488%2C134&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.6 5.1\" width=\"488\" height=\"134\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.6 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 6.<\/strong><br \/>\n\u090a\u0901\u091a\u093e\u0908 1 \u092e\u0940\u091f\u0930 \u0935\u093e\u0932\u0947 \u090f\u0915 \u092c\u0947\u0932\u0928\u093e\u0915\u093e\u0930 \u092c\u0930\u094d\u0924\u0928 \u0915\u0940 \u0927\u093e\u0930\u093f\u0924\u093e 15.4 \u0932\u0940\u091f\u0930 \u0939\u0948\u0964 \u0907\u0938\u0915\u094b \u092c\u0928\u093e\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u0915\u093f\u0924\u0928\u0947 \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930 \u0927\u093e\u0924\u0941 \u0915\u0940 \u0936\u0940\u091f \u0915\u0940 \u0906\u0935\u0936\u094d\u092f\u0915\u0924\u093e \u0939\u094b\u0917\u0940?<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1844\/44487482561_38d78bb13a_o.png?resize=673%2C573&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.6 6\" width=\"673\" height=\"573\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.6 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 7.<\/strong><br \/>\n\u0938\u0940\u0938\u0947 \u0915\u0940 \u090f\u0915 \u092a\u0947\u0902\u0938\u093f\u0932 (lead pencil) \u0932\u0915\u0921\u093c\u0940 \u0915\u0947 \u090f\u0915 \u092c\u0947\u0932\u0928 \u0915\u0947 \u0905\u092d\u094d\u092f\u0928\u094d\u0924\u0930 \u092e\u0947\u0902 \u0917\u094d\u0930\u0947\u092b\u093e\u0907\u091f (graphite) \u0938\u0947 \u092c\u0928\u0947 \u0920\u094b\u0938 \u092c\u0947\u0932\u0928 \u0915\u094b \u0921\u093e\u0932 \u0915\u0930 \u092c\u0928\u093e\u0908 \u0917\u0908 \u0939\u0948\u0964 \u092a\u0947\u0902\u0938\u093f\u0932 \u0915\u093e \u0935\u094d\u092f\u093e\u0938 7 \u092e\u093f\u092e\u0940 \u0939\u0948 \u0914\u0930 \u0917\u094d\u0930\u0947\u092b\u093e\u0907\u091f \u0915\u093e \u0935\u094d\u092f\u093e\u0938 1 \u092e\u093f\u092e\u0940 \u0939\u0948\u0964 \u092f\u0926\u093f \u092a\u0947\u0902\u0938\u093f\u0932 \u0915\u0940 \u0932\u092e\u094d\u092c\u093e\u0908\u0964 14 \u0938\u0947\u092e\u0940 \u0939\u0948 \u0924\u094b \u0932\u0915\u0921\u093c\u0940 \u0915\u093e \u0906\u092f\u0924\u0928 \u0914\u0930 \u0917\u094d\u0930\u0947\u092b\u093e\u0907\u091f \u0915\u093e \u0906\u092f\u0924\u0928 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i1.wp.com\/farm2.staticflickr.com\/1877\/44487482911_8c0382ea08_o.png?resize=505%2C200&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.6 7\" width=\"505\" height=\"200\" data-recalc-dims=\"1\" \/><br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm2.staticflickr.com\/1848\/44487482731_240aea06ec_o.png?resize=603%2C212&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.6 7.1\" width=\"603\" height=\"212\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.6 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 8.<\/strong><br \/>\n\u090f\u0915 \u0905\u0938\u094d\u092a\u0924\u093e\u0932 (hospital) \u0915\u0947 \u090f\u0915 \u0930\u094b\u0917\u0940 \u0915\u094b \u092a\u094d\u0930\u0924\u093f\u0926\u093f\u0928 7 \u0938\u0947\u092e\u0940 \u0935\u094d\u092f\u093e\u0938 \u0935\u093e\u0932\u0947 \u090f\u0915 \u092c\u0947\u0932\u0928\u093e\u0915\u093e\u0930 \u0915\u091f\u094b\u0930\u0947 \u092e\u0947\u0902 \u0938\u0942\u092a (soup) \u0926\u093f\u092f\u093e \u091c\u093e\u0924\u093e \u0939\u0948\u0964 \u092f\u0926\u093f \u092f\u0939 \u0915\u091f\u094b\u0930\u093e \u0938\u0942\u092a \u0938\u0947 4 \u0938\u0947\u092e\u0940 \u090a\u0901\u091a\u093e\u0908 \u0924\u0915 \u092d\u0930\u093e \u091c\u093e\u0924\u093e \u0939\u0948 \u0924\u094b \u0907\u0938 \u0905\u0938\u094d\u092a\u0924\u093e\u0932 \u092e\u0947\u0902 250 \u0930\u094b\u0917\u093f\u092f\u094b\u0902 \u0915\u0947 \u0932\u093f\u090f \u092a\u094d\u0930\u0924\u093f\u0926\u093f\u0928 \u0915\u093f\u0924\u0928\u093e \u0938\u0942\u092a \u0924\u0948\u092f\u093e\u0930 \u0915\u093f\u092f\u093e \u091c\u093e\u0924\u093e \u0939\u0948?<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u0926\u093f\u092f\u093e \u0939\u0948, \u092c\u0947\u0932\u0928\u093e\u0915\u093e\u0930 \u0915\u091f\u094b\u0930\u0947 \u0915\u093e \u0935\u094d\u092f\u093e\u0938 = 7 \u0938\u0947\u092e\u0940<br \/>\n\u0915\u091f\u094b\u0930\u0947 \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e (r) = \\(\\frac { 7 }{ 2 }\\) \u0938\u0947\u092e\u0940<br \/>\n\u0914\u0930 \u0915\u091f\u094b\u0930\u0947 \u0915\u0940 \u090a\u0901\u091a\u093e\u0908 (h) = 4 \u0938\u0947\u092e\u0940<br \/>\n\u0915\u091f\u094b\u0930\u0947 \u092e\u0947\u0902 \u0921\u093e\u0932\u0947 \u0917\u090f \u0938\u0942\u092a \u0915\u093e \u0906\u092f\u0924\u0928 = \u03c0r\u00b2h<br \/>\n= \\(\\frac { 22 }{ 7 }\\) x \\(\\frac { 7 }{ 2 }\\) x \\(\\frac { 7 }{ 2 }\\) x 4 = 154 \u0918\u0928 \u0938\u0947\u092e\u0940<br \/>\n1 \u0930\u094b\u0917\u0940 \u0915\u0947 \u0932\u093f\u090f \u0906\u0935\u0936\u094d\u092f\u0915 \u0938\u0942\u092a \u0915\u0940 \u092e\u093e\u0924\u094d\u0930\u093e = 154 \u0918\u0928 \u0938\u0947\u092e\u0940<br \/>\n250 \u0930\u094b\u0917\u093f\u092f\u094b\u0902 \u0915\u0947 \u0932\u093f\u090f \u0906\u0935\u0936\u094d\u092f\u0915 \u0938\u0942\u092a \u0915\u0940 \u092e\u093e\u0924\u094d\u0930\u093e = 250 x 154 = 38,500 \u0918\u0928 \u0938\u0947\u092e\u0940<br \/>\n\u0905\u0924\u0903 \u092a\u094d\u0930\u0924\u093f\u0926\u093f\u0928 38,500 \u0918\u0928 \u0938\u0947\u092e\u0940 \u0938\u0942\u092a \u0924\u0948\u092f\u093e\u0930 \u0915\u093f\u092f\u093e \u091c\u093e\u0924\u093e \u0939\u0948\u0964<\/p>\n<p style=\"text-align: center;\"><span style=\"color: #0000ff;\"><strong>\u092a\u094d\u0930\u0936\u094d\u0928\u093e\u0935\u0932\u0940 13.7<\/strong><\/span><\/p>\n<p><strong>\u091c\u092c \u0924\u0915 \u0905\u0928\u094d\u092f\u0925\u093e \u0928 \u0915\u0939\u093e \u091c\u093e\u090f, \u03c0 = \\(\\frac { 22 }{ 7 }\\) \u0932\u0940\u091c\u093f\u090f\u0964<\/strong><br \/>\n<strong>Ex 13.7 Class 9 \u0917\u0923\u093f\u0924 \u092a\u094d\u0930\u0936\u094d\u0928 1.<\/strong><br \/>\n\u0909\u0938 \u0932\u092e\u094d\u092c\u0935\u0943\u0924\u094d\u0924\u0940\u092f \u0936\u0902\u0915\u0941 \u0915\u093e \u0906\u092f\u0924\u0928 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f, \u091c\u093f\u0938\u0915\u0940<br \/>\n(i) \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e 6 \u0938\u0947\u092e\u0940 \u0914\u0930 \u090a\u0901\u091a\u093e\u0908 7 \u0938\u0947\u092e\u0940 \u0939\u0948\u0964<br \/>\n(ii) \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e 3.5 \u0938\u0947\u092e\u0940 \u0914\u0930 \u090a\u0901\u091a\u093e\u0908 12 \u0938\u0947\u092e\u0940 \u0939\u0948\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm2.staticflickr.com\/1869\/44487483181_b2421e8786_o.png?resize=593%2C319&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.7 1\" width=\"593\" height=\"319\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.7 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 2.<\/strong><br \/>\n\u0936\u0902\u0915\u0941 \u0915\u0947 \u0906\u0915\u093e\u0930 \u0915\u0947 \u0909\u0938 \u092c\u0930\u094d\u0924\u0928 \u0915\u0940 \u0932\u0940\u091f\u0930\u094b\u0902 \u092e\u0947\u0902 \u0927\u093e\u0930\u093f\u0924\u093e \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f \u091c\u093f\u0938\u0915\u0940<br \/>\n(i) \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e 7 \u0938\u0947\u092e\u0940 \u0914\u0930 \u0924\u093f\u0930\u094d\u092f\u0915 \u090a\u0901\u091a\u093e\u0908 25 \u0938\u0947\u092e\u0940 \u0939\u0948\u0964<br \/>\n(ii) \u090a\u0901\u091a\u093e\u0908 12 \u0938\u0947\u092e\u0940 \u0914\u0930 \u0924\u093f\u0930\u094d\u092f\u0915 \u090a\u0901\u091a\u093e\u0908 13 \u0938\u0947\u092e\u0940 \u0939\u0948\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1871\/43578316985_0b03433a16_o.png?resize=666%2C354&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.7 2\" width=\"666\" height=\"354\" data-recalc-dims=\"1\" \/><br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm2.staticflickr.com\/1871\/44487484061_7ee358b0c9_o.png?resize=611%2C392&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.7 2.1\" width=\"611\" height=\"392\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.7 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 3.<\/strong><br \/>\n\u090f\u0915 \u0936\u0902\u0915\u0941 \u0915\u0940 \u090a\u0901\u091a\u093e\u0908 15 \u0938\u0947\u092e\u0940 \u0939\u0948\u0964 \u092f\u0926\u093f \u0907\u0938\u0915\u093e \u0906\u092f\u0924\u0928 1570 \u0938\u0947\u092e\u0940 \u0939\u0948 \u0924\u094b \u0907\u0938\u0915\u0947 \u0906\u0927\u093e\u0930 \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964 (\u03c0 = 3.14) \u092a\u094d\u0930\u092f\u094b\u0917 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm2.staticflickr.com\/1868\/43578317075_91ce22763f_o.png?resize=596%2C279&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.7 3\" width=\"596\" height=\"279\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.7 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 4.<\/strong><br \/>\n\u092f\u0926\u093f 9 \u0938\u0947\u092e\u0940 \u090a\u0901\u091a\u093e\u0908 \u0935\u093e\u0932\u0947 \u090f\u0915 \u0932\u092e\u094d\u092c\u0935\u0943\u0924\u094d\u0924\u0940\u092f \u0936\u0902\u0915\u0941 \u0915\u093e \u0906\u092f\u0924\u0928 48\u03c0 \u0938\u0947\u092e\u0940 \u0939\u0948 \u0924\u094b \u0907\u0938\u0915\u0947 \u0906\u0927\u093e\u0930 \u0915\u093e \u0935\u094d\u092f\u093e\u0938 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i1.wp.com\/farm2.staticflickr.com\/1889\/44438516022_a4bc885436_o.png?resize=534%2C276&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.7 4\" width=\"534\" height=\"276\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.7 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 5.<\/strong><br \/>\n\u090a\u092a\u0930\u0940 \u0935\u094d\u092f\u093e\u0938 3.5 \u092e\u0940\u091f\u0930 \u0935\u093e\u0932\u0947 \u0936\u0902\u0915\u0941 \u0915\u0947 \u0906\u0915\u093e\u0930 \u0915\u093e \u090f\u0915 \u0917\u0921\u094d\u0922\u093e 12 \u092e\u0940\u091f\u0930 \u0917\u0939\u0930\u093e \u0939\u0948\u0964 \u0907\u0938\u0915\u0940 \u0927\u093e\u0930\u093f\u0924\u093e \u0915\u093f\u0932\u094b\u0932\u0940\u091f\u0930\u094b\u0902 \u092e\u0947\u0902 \u0915\u093f\u0924\u0928\u0940 \u0939\u0948?<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1846\/44438516092_26d7a983df_o.png?resize=675%2C288&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.7 5\" width=\"675\" height=\"288\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.7 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 6.<\/strong><br \/>\n\u090f\u0915 \u0932\u092e\u094d\u092c\u0935\u0943\u0924\u094d\u0924\u0940\u092f \u0936\u0902\u0915\u0941 \u0915\u093e \u0906\u092f\u0924\u0928 9856 \u0938\u0947\u092e\u0940 \u0939\u0948\u0964 \u092f\u0926\u093f \u0907\u0938\u0915\u0947 \u0906\u0927\u093e\u0930 \u0915\u093e \u0935\u094d\u092f\u093e\u0938 28 \u0938\u0947\u092e\u0940 \u0939\u0948 \u0924\u094b \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f :<br \/>\n(i) \u0936\u0902\u0915\u0941 \u0915\u0940 \u090a\u0901\u091a\u093e\u0908<br \/>\n(ii) \u0936\u0902\u0915\u0941 \u0915\u0940 \u0924\u093f\u0930\u094d\u092f\u0915 \u090a\u0901\u091a\u093e\u0908<br \/>\n(iii) \u0936\u0902\u0915\u0941 \u0915\u093e \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1877\/44438516402_4721713327_o.png?resize=586%2C243&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.7 6\" width=\"586\" height=\"243\" data-recalc-dims=\"1\" \/><br \/>\n<img loading=\"lazy\" src=\"https:\/\/i1.wp.com\/farm2.staticflickr.com\/1894\/44438516252_a9f571d889_o.png?resize=637%2C362&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.7 6.1\" width=\"637\" height=\"362\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.7 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 7.<\/strong><br \/>\n\u092d\u0941\u091c\u093e\u0913\u0902 5 \u0938\u0947\u092e\u0940, 12 \u0938\u0947\u092e\u0940 \u0914\u0930 13 \u0938\u0947\u092e\u0940 \u0935\u093e\u0932\u0947 \u090f\u0915 \u0938\u092e\u0915\u094b\u0923 \u0924\u094d\u0930\u093f\u092d\u0941\u091c ABC \u0915\u094b \u092d\u0941\u091c\u093e 12 \u0938\u0947\u092e\u0940 \u0915\u0947 \u092a\u0930\u093f\u0924\u0903 \u0918\u0941\u092e\u093e\u092f\u093e \u091c\u093e\u0924\u093e \u0939\u0948\u0964 \u0907\u0938 \u092a\u094d\u0930\u0915\u093e\u0930 \u092a\u094d\u0930\u093e\u092a\u094d\u0924 \u0920\u094b\u0938 \u0915\u093e \u0906\u092f\u0924\u0928 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1847\/44438516532_5c48675b78_o.png?resize=675%2C200&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.7 7\" width=\"675\" height=\"200\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.7 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 8.<\/strong><br \/>\n\u092f\u0926\u093f \u092a\u094d\u0930\u0936\u094d\u0928 7 \u0915\u0947 \u0924\u094d\u0930\u093f\u092d\u0941\u091c ABC \u0915\u094b \u092f\u0926\u093f \u092d\u0941\u091c\u093e 5 \u0938\u0947\u092e\u0940 \u0915\u0947 \u092a\u0930\u093f\u0924\u0903 \u0918\u0941\u092e\u093e\u092f\u093e \u091c\u093e\u090f, \u0924\u094b \u0907\u0938 \u092a\u094d\u0930\u0915\u093e\u0930 \u092a\u094d\u0930\u093e\u092a\u094d\u0924 \u0920\u094b\u0938 \u0915\u093e \u0906\u092f\u0924\u0928 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964 \u092a\u094d\u0930\u0936\u094d\u0928 7 \u0914\u0930 8 \u092e\u0947\u0902 \u092a\u094d\u0930\u093e\u092a\u094d\u0924 \u0915\u093f\u090f \u0917\u090f \u0926\u094b\u0928\u094b\u0902 \u0920\u094b\u0938\u094b\u0902 \u0915\u0947 \u0906\u092f\u0924\u0928\u094b\u0902 \u0915\u093e \u0905\u0928\u0941\u092a\u093e\u0924 \u092d\u0940 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1864\/44438516572_b9245ab84b_o.png?resize=678%2C230&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.7 8\" width=\"678\" height=\"230\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.7 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 9.<\/strong><br \/>\n\u0917\u0947\u0939\u0942\u0901 \u0915\u0940 \u090f\u0915 \u0922\u0947\u0930\u0940 10.5 \u092e\u0940\u091f\u0930 \u0935\u094d\u092f\u093e\u0938 \u0914\u0930 3 \u092e\u0940\u091f\u0930 \u090a\u0901\u091a\u093e\u0908 \u0935\u093e\u0932\u0947 \u090f\u0915 \u0936\u0902\u0915\u0941 \u0915\u0947 \u0906\u0915\u093e\u0930 \u0915\u0940 \u0939\u0948\u0964 \u0907\u0938\u0915\u093e \u0906\u092f\u0924\u0928 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964 \u0907\u0938 \u0922\u0947\u0930\u0940 \u0915\u094b \u0935\u0930\u094d\u0937\u093e \u0938\u0947 \u092c\u091a\u093e\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u0915\u0948\u0928\u0935\u093e\u0938 \u0938\u0947 \u0922\u0902\u0915\u093e \u091c\u093e\u0924\u093e \u0939\u0948\u0964 \u0935\u0949\u091b\u093f\u0924 \u0915\u0948\u0928\u0935\u093e\u0938 \u0915\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u0926\u093f\u092f\u093e \u0939\u0948, \u0917\u0947\u0939\u0942\u0902 \u0915\u0940 \u0926\u0947\u0930\u0940 \u0938\u0947 \u092c\u0928\u0947 \u0936\u0902\u0915\u0941 \u0915\u0940 \u090a\u0901\u091a\u093e\u0908 (h) = 3 \u092e\u0940\u091f\u0930 \u0924\u0925\u093e<br \/>\n\u0906\u0927\u093e\u0930 \u0915\u093e \u0935\u094d\u092f\u093e\u0938 = 10.5 \u092e\u0940\u091f\u0930 = \\(\\frac { 21 }{ 2 }\\) \u092e\u0940\u091f\u0930<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1845\/42678470370_42c9a45fdc_o.png?resize=610%2C519&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.7 9\" width=\"610\" height=\"519\" data-recalc-dims=\"1\" \/><\/p>\n<p style=\"text-align: center;\"><span style=\"color: #0000ff;\"><strong>\u092a\u094d\u0930\u0936\u094d\u0928\u093e\u0935\u0932\u0940 13.8<\/strong><\/span><\/p>\n<p><strong>\u091c\u092c \u0924\u0915 \u0905\u0928\u094d\u092f\u0925\u093e \u0928 \u0915\u0939\u093e \u091c\u093e\u090f, \u03c0 = \\(\\frac { 22 }{ 7 }\\) \u0932\u0940\u091c\u093f\u090f\u0964<\/strong><br \/>\n<strong>Ex 13.8 Class 9 \u0917\u0923\u093f\u0924 \u092a\u094d\u0930\u0936\u094d\u0928 1.<\/strong><br \/>\n\u0909\u0938 \u0917\u094b\u0932\u0947 \u0915\u093e \u0906\u092f\u0924\u0928 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f \u091c\u093f\u0938\u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e \u0928\u093f\u092e\u094d\u0928\u0932\u093f\u0916\u093f\u0924 \u0939\u0948\u0902:<br \/>\n(i) 7 \u0938\u0947\u092e\u0940<br \/>\n(ii) 0.63 \u092e\u0940\u091f\u0930<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i1.wp.com\/farm2.staticflickr.com\/1857\/44438516762_73fd07259e_o.png?resize=557%2C419&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.8 1\" width=\"557\" height=\"419\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.8 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 2.<\/strong><br \/>\n\u0909\u0938 \u0921\u094b\u0938 \u0917\u094b\u0932\u093e\u0915\u093e\u0930 \u0917\u0947\u0902\u0926 \u0926\u094d\u0935\u093e\u0930\u093e \u0939\u091f\u093e\u090f \u0917\u090f (\u0935\u093f\u0938\u094d\u0925\u093e\u092a\u093f\u0924) \u092a\u093e\u0928\u0940 \u0915\u093e \u0906\u092f\u0924\u0928 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f, \u091c\u093f\u0938\u0915\u093e \u0935\u094d\u092f\u093e\u0938 \u0928\u093f\u092e\u094d\u0928\u0932\u093f\u0916\u093f\u0924 \u0939\u0948:<br \/>\n(i) 28 \u0938\u0947\u092e\u0940<br \/>\n(ii) 0.21 \u092e\u0940\u091f\u0930<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1879\/44438516842_3a00b73d8f_o.png?resize=507%2C487&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.8 2\" width=\"507\" height=\"487\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.8 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 3.<\/strong><br \/>\n\u0927\u093e\u0924\u0941 \u0915\u0940 \u090f\u0915 \u0917\u0947\u0902\u0926 \u0915\u093e \u0935\u094d\u092f\u093e\u0938 4.2 \u0938\u0947\u092e\u0940 \u0939\u0948\u0964 \u092f\u0926\u093f \u0907\u0938 \u0927\u093e\u0924\u0941 \u0915\u093e \u0918\u0928\u0924\u094d\u0935 8.9 \u0917\u094d\u0930\u093e\u092e \u092a\u094d\u0930\u0924\u093f \u0918\u0928 \u0938\u0947\u092e\u0940 \u0939\u0948, \u0924\u094b \u0907\u0938 \u0917\u0947\u0902\u0926 \u0915\u093e \u0926\u094d\u0930\u0935\u094d\u092f\u092e\u093e\u0928 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm2.staticflickr.com\/1874\/42678470510_e11d3d6ece_o.png?resize=677%2C258&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.8 3\" width=\"677\" height=\"258\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.8 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 4.<\/strong><br \/>\n\u091a\u0928\u094d\u0926\u094d\u0930\u092e\u093e \u0915\u093e \u0935\u094d\u092f\u093e\u0938 \u092a\u0943\u0925\u094d\u0935\u0940 \u0915\u0947 \u0935\u094d\u092f\u093e\u0938 \u0915\u093e \u0932\u0917\u092d\u0917 \u090f\u0915-\u091a\u094c\u0925\u093e\u0908 \u0939\u0948\u0964 \u091a\u0928\u094d\u0926\u094d\u0930\u092e\u093e \u0915\u093e \u0906\u092f\u0924\u0928 \u092a\u0943\u0925\u094d\u0935\u0940 \u0915\u0947 \u0906\u092f\u0924\u0928 \u0915\u0940 \u0915\u094c\u0928-\u0938\u0940 \u092d\u093f\u0928\u094d\u0928 \u0939\u0948?<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u092e\u093e\u0928\u093e \u092a\u0943\u0925\u094d\u0935\u0940 \u0915\u093e \u0935\u094d\u092f\u093e\u0938 4D \u092e\u0940\u091f\u0930 \u0939\u0948\u0964<br \/>\n\u092a\u0943\u0925\u094d\u0935\u0940 \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e (R) = 2D \u092e\u0940\u091f\u0930<br \/>\n\u092a\u094d\u0930\u0936\u094d\u0928\u093e\u0928\u0941\u0938\u093e\u0930,\u091a\u0928\u094d\u0926\u094d\u0930\u092e\u093e \u0915\u093e \u0935\u094d\u092f\u093e\u0938 = \\(\\frac { 1 }{ 4 }\\) x \u092a\u0943\u0925\u094d\u0935\u0940 \u0915\u093e \u0935\u094d\u092f\u093e\u0938<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i1.wp.com\/farm2.staticflickr.com\/1853\/42678470840_ee69166fc3_o.png?resize=636%2C486&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.8 4\" width=\"636\" height=\"486\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.8 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 5.<\/strong><br \/>\n\u0935\u094d\u092f\u093e\u0938 10.5 \u0938\u0947\u092e\u0940 \u0935\u093e\u0932\u0947 \u090f\u0915 \u0905\u0930\u094d\u0926\u094d\u0927\u0917\u094b\u0932\u093e\u0915\u093e\u0930 \u0915\u091f\u094b\u0930\u0947 \u092e\u0947\u0902 \u0915\u093f\u0924\u0928\u0947 \u0932\u0940\u091f\u0930 \u0926\u0942\u0927 \u0906 \u0938\u0915\u0924\u093e \u0939\u0948\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm2.staticflickr.com\/1861\/42678470960_deba5abedc_o.png?resize=679%2C339&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.8 5\" width=\"679\" height=\"339\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.8 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 6.<\/strong><br \/>\n\u090f\u0915 \u0905\u0930\u094d\u0926\u094d\u0927\u0917\u094b\u0932\u093e\u0915\u093e\u0930 \u091f\u0902\u0915\u0940 1 \u0938\u0947\u092e\u0940 \u092e\u094b\u091f\u0940 \u090f\u0915 \u0932\u094b\u0939\u0947 \u0915\u0940 \u091a\u093e\u0926\u0930 (sheet) \u0938\u0947 \u092c\u0928\u0940 \u0939\u0948\u0964 \u092f\u0926\u093f \u0907\u0938\u0915\u0940 \u0906\u0928\u094d\u0924\u0930\u093f\u0915 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e 1 \u092e\u0940\u091f\u0930 \u0939\u0948, \u0924\u094b \u0907\u0938 \u091f\u0902\u0915\u0940 \u0915\u0947 \u092c\u0928\u093e\u0928\u0947 \u092e\u0947\u0902 \u0932\u0917\u0947 \u0932\u094b\u0939\u0947 \u0915\u093e \u0906\u092f\u0924\u0928 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u0926\u093f\u092f\u093e \u0939\u0948, \u091f\u0902\u0915\u0940 \u0905\u0930\u094d\u0926\u094d\u0927\u0917\u094b\u0932\u093e\u0915\u093e\u0930 \u0939\u0948 \u0914\u0930 \u0909\u0938\u0915\u0940 \u0906\u0928\u094d\u0924\u0930\u093f\u0915 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e (r) = 1 \u092e\u0940\u091f\u0930<br \/>\n\u0924\u0925\u093e \u091f\u0902\u0915\u0940 \u0915\u0940 \u091a\u093e\u0926\u0930 \u0915\u0940 \u092e\u094b\u091f\u093e\u0908 = 1 \u0938\u0947\u092e\u0940 = \\(\\frac { 1 }{ 100 }\\) \u092e\u0940\u091f\u0930 = 001 \u092e\u0940\u091f\u0930<br \/>\n\u091f\u0902\u0915\u0940 \u0915\u0940 \u092c\u093e\u0939\u094d\u092f \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e (R) = (1 + 0.01) \u092e\u0940\u091f\u0930 = 1.01 \u092e\u0940\u091f\u0930<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1882\/42678471070_70ff583e1c_o.png?resize=622%2C375&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.8 6\" width=\"622\" height=\"375\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.8 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 7.<\/strong><br \/>\n\u0909\u0938 \u0917\u094b\u0932\u0947 \u0915\u093e \u0906\u092f\u0924\u0928 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f \u091c\u093f\u0938\u0915\u093e \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 154 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940 \u0939\u0948\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1892\/44438517362_ce17dddf00_o.png?resize=570%2C387&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.8 7\" width=\"570\" height=\"387\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.8 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 8.<\/strong><br \/>\n\u0915\u093f\u0938\u0940 \u092d\u0935\u0928 \u0915\u093e \u0917\u0941\u092e\u094d\u092c\u0926 \u090f\u0915 \u0905\u0930\u094d\u0926\u094d\u0927\u0917\u094b\u0932\u0947 \u0915\u0947 \u0906\u0915\u093e\u0930 \u0915\u093e \u0939\u0948\u0964 \u0905\u0928\u094d\u0926\u0930 \u0938\u0947, \u0907\u0938\u092e\u0947\u0902 \u0938\u092b\u0947\u0926\u0940 \u0915\u0930\u093e\u0928\u0947 \u092e\u0947\u0902 \u20b9 498.96 \u0935\u094d\u092f\u092f \u0939\u0941\u090f\u0964 \u092f\u0926\u093f \u0938\u092b\u0947\u0926\u0940 \u0915\u0930\u093e\u0928\u0947 \u0915\u0940 \u0926\u0930 \u20b9 2 \u092a\u094d\u0930\u0924\u093f \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930 \u0939\u0948 \u0924\u094b \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f :<br \/>\n(i) \u0917\u0941\u092e\u094d\u092c\u0926 \u0915\u094b \u0906\u0928\u094d\u0924\u0930\u093f\u0915 \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932<br \/>\n(ii) \u0917\u0941\u092e\u094d\u092c\u0926 \u0915\u0947 \u0905\u0928\u094d\u0926\u0930 \u0915\u0940 \u0939\u0935\u093e \u0915\u093e \u0906\u092f\u0924\u0928<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n(i) \u092e\u093e\u0928\u093e \u0905\u0930\u094d\u0926\u094d\u0927\u0917\u094b\u0932\u093e\u0915\u093e\u0930 \u0917\u0941\u092e\u094d\u092c\u0926 \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e \u092e\u0940\u091f\u0930 \u0939\u0948\u0964<br \/>\n\u0905\u0930\u094d\u0926\u094d\u0927\u0917\u094b\u0932\u093e\u0915\u093e\u0930 \u0917\u0941\u092e\u094d\u092c\u0926 \u0916\u094b\u0916\u0932\u093e \u0939\u094b\u0924\u093e \u0939\u0948\u0964<br \/>\n\u0917\u0941\u092e\u094d\u092c\u0926 \u0915\u093e \u0906\u0928\u094d\u0924\u0930\u093f\u0915 \u092a\u0943\u0937\u094d\u0920 = 2\u03c0r\u00b2 \u0935\u0930\u094d\u0917 \u092e\u0940\u091f\u0930<br \/>\n\u0924\u092c \u0917\u0941\u092e\u094d\u092c\u0926 \u0915\u0947 \u0906\u0928\u094d\u0924\u0930\u093f\u0915 \u092a\u0943\u0937\u094d\u0920 \u092a\u0930 \u0938\u092b\u0947\u0926\u0940 \u0915\u0930\u093e\u0928\u0947 \u0915\u093e \u0935\u094d\u092f\u092f = 2\u03c0r\u00b2 x 2 = 4\u03c0r\u00b2<br \/>\n\u092a\u0930\u0928\u094d\u0924\u0941 \u092a\u094d\u0930\u0936\u094d\u0928 \u092e\u0947\u0902 \u0926\u093f\u092f\u093e \u0917\u092f\u093e \u0939\u0948 \u0915\u093f \u0938\u092b\u0947\u0926\u0940 \u0915\u0930\u093e\u0928\u0947 \u0915\u0940 \u0935\u094d\u092f\u092f \u20b9 498.96 \u0939\u0948\u0964<br \/>\n4\u03c0r\u00b2 = 498.96<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i1.wp.com\/farm2.staticflickr.com\/1846\/44438517392_b90d249f97_o.png?resize=524%2C312&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.8 8\" width=\"524\" height=\"312\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.8 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 9.<\/strong><br \/>\n\u0932\u094b\u0939\u0947 \u0915\u0947 \u0938\u0924\u094d\u0924\u093e\u0907\u0938 \u0920\u094b\u0938 \u0917\u094b\u0932\u094b\u0902 \u0915\u094b \u092a\u093f\u0918\u0932\u093e\u0915\u0930, \u091c\u093f\u0928\u092e\u0947\u0902 \u0938\u0947 \u092a\u094d\u0930\u0924\u094d\u092f\u0947\u0915 \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e r \u0939\u0948 \u0914\u0930 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 S \u0939\u0948, \u090f\u0915 \u092c\u0921\u093c\u093e \u0917\u094b\u0932\u093e \u092c\u0928\u093e\u092f\u093e \u091c\u093e\u0924\u093e \u0939\u0948, \u091c\u093f\u0938\u0915\u093e \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 S&#8221; \u0939\u0948\u0964 \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f :<br \/>\n(i) \u0928\u090f \u0917\u094b\u0932\u0947 \u0915\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e r&#8217;<br \/>\n(ii) S \u0914\u0930 S&#8221; \u0915\u093e \u0905\u0928\u0941\u092a\u093e\u0924\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i2.wp.com\/farm2.staticflickr.com\/1893\/42678471420_82f79d62e1_o.png?resize=679%2C455&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.8 9\" width=\"679\" height=\"455\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.8 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 10.<\/strong><br \/>\n\u0926\u0935\u093e\u0908 \u0915\u093e \u090f\u0915 \u0915\u0948\u092a\u0938\u0942\u0932 (capsule) 3.5 \u092e\u093f\u092e\u0940 \u0935\u094d\u092f\u093e\u0938 \u0915\u093e \u090f\u0915 \u0917\u094b\u0932\u093e (\u0917\u094b\u0932\u0940) \u0939\u0948\u0964 \u0907\u0938 \u0915\u0948\u092a\u0938\u0942\u0932 \u0915\u094b \u092d\u0930\u0928\u0947 \u0915\u0947 \u0932\u093f\u090f \u0915\u093f\u0924\u0928\u0940 \u0926\u0935\u093e\u0908 (\u092e\u093f\u092e\u0940 \u092e\u0947\u0902) \u0915\u0940 \u0906\u0935\u0936\u094d\u092f\u0915\u0924\u093e \u0939\u094b\u0917\u0940?<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1881\/42678471810_519639483a_o.png?resize=451%2C123&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.8 10\" width=\"451\" height=\"123\" data-recalc-dims=\"1\" \/><br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1844\/44438517602_de8dc4f19e_o.png?resize=671%2C204&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.8 10.1\" width=\"671\" height=\"204\" data-recalc-dims=\"1\" \/><\/p>\n<p style=\"text-align: center;\"><span style=\"color: #0000ff;\"><strong>\u092a\u094d\u0930\u0936\u094d\u0928\u093e\u0935\u0932\u0940 13.9 (\u0910\u091a\u094d\u091b\u093f\u0915)<\/strong><\/span><\/p>\n<p><strong>Ex 13.9 Class 9 \u0917\u0923\u093f\u0924 \u092a\u094d\u0930\u0936\u094d\u0928 1.<\/strong><br \/>\n\u090f\u0915 \u0932\u0915\u0921\u093c\u0940 \u0915\u0947 \u092c\u0941\u0915-\u0936\u0948\u0932\u094d\u092b (book- shelf) \u0915\u0940 \u092c\u093e\u0939\u0930\u0940 \u0935\u093f\u092e\u093e\u090f\u0901 \u0928\u093f\u092e\u094d\u0928\u0932\u093f\u0916\u093f\u0924 \u0939\u0948\u0902 \u090a\u0901\u091a\u093e\u0908 = 110 \u0938\u0947\u092e\u0940, \u0917\u0939\u0930\u093e\u0908 = 25 \u0938\u0947\u092e\u0940, \u091a\u094c\u0921\u093c\u093e\u0908 = 85 \u0938\u0947\u092e\u0940\u0964 \u092a\u094d\u0930\u0924\u094d\u092f\u0947\u0915 \u0938\u094d\u0925\u093e\u0928 \u092a\u0930 \u0924\u0916\u094d\u0924\u094b\u0902 \u0915\u0940 \u092e\u094b\u091f\u093e\u0908 5 \u0938\u0947\u092e\u0940 \u0939\u0948\u0964 \u0907\u0938\u0915\u0947 \u092c\u093e\u0939\u0930\u0940 \u092b\u0932\u0915\u094b\u0902 \u092a\u0930 \u092a\u0949\u0932\u093f\u0936 \u0915\u0930\u093e\u0908 \u091c\u093e\u0924\u0940 \u0939\u0948 \u0914\u0930 \u0906\u0928\u094d\u0924\u0930\u093f\u0915 \u092b\u0932\u0915\u094b\u0902 \u092a\u0930 \u092a\u0947\u0902\u091f \u0915\u093f\u092f\u093e \u091c\u093e\u0928\u093e \u0939\u0948\u0964 \u092f\u0926\u093f \u092a\u0949\u0932\u093f\u0936 \u0915\u0930\u093e\u0928\u0947 \u0915\u0940 \u0926\u0930 20 \u092a\u0948\u0938\u0947 \u092a\u094d\u0930\u0924\u093f \u0938\u0947\u092e\u0940 \u0939\u0948 \u0914\u0930 \u092a\u0947\u0902\u091f \u0915\u0930\u093e\u0928\u0947 \u0915\u0940 \u0926\u0930 10 \u092a\u0948\u0938\u0947 \u092a\u094d\u0930\u0924\u093f \u0938\u0947\u092e\u0940 \u0939\u0948 \u0924\u094b \u0907\u0938 \u092c\u0941\u0915-\u0936\u0948\u0932\u094d\u092b \u092a\u0930 \u092a\u0949\u0932\u093f\u0936 \u0914\u0930 \u092a\u0947\u0902\u091f \u0915\u0930\u093e\u0928\u0947 \u0915\u093e \u0915\u0941\u0932 \u0935\u094d\u092f\u092f \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1896\/42678472080_7b2d57c4aa_o.png?resize=222%2C236&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.9 1\" width=\"222\" height=\"236\" data-recalc-dims=\"1\" \/><br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u092c\u0941\u0915-\u0936\u0948\u0932\u094d\u092b \u0915\u0947 \u092c\u093e\u0939\u0930\u0940 \u092b\u0932\u0915\u094b\u0902 \u0915\u093e \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932<br \/>\n= 2 [(25 x 110) + (25 x 85)] + (85 x 110) \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n= 2 [2,750 + 2,125] + 9,350 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940\u0964<br \/>\n= (2 x 4,875) + 9,350 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n= 9,750 + 9,350 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940\u0964<br \/>\n= 19,100 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n\u0907\u0938\u0915\u0947 \u0905\u0924\u093f\u0930\u093f\u0915\u094d\u0924 \u0938\u093e\u092e\u0928\u0947 \u0915\u0947 \u092b\u094d\u0930\u0947\u092e \u0915\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930 \u0914\u0930 \u092a\u0947\u0902\u091f \u0939\u094b\u0917\u093e\u0964 \u092b\u094d\u0930\u0947\u092e \u0915\u0947 \u092a\u0943\u0937\u094d\u0920 \u0915\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932<br \/>\n= (110 x 85) &#8211; [ (30 + 30 + 30 + 10) x 75] + (75 x 5) + (75 x 5) \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n= 9,350 &#8211; 7,500 + 375 + 375 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n= 2,600 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1850\/42678471950_336b116e8d_o.png?resize=205%2C189&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.9 1.1\" width=\"205\" height=\"189\" data-recalc-dims=\"1\" \/><br \/>\n\u091c\u093f\u0938 \u092d\u093e\u0917 \u092a\u0930 \u092a\u0949\u0932\u093f\u0936 \u0939\u094b\u0928\u0940 \u0939\u0948, \u0909\u0938\u0915\u093e \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 19,100 + 2,600 = 21,700 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n\u0905\u0924\u0903 \u092a\u0949\u0932\u093f\u0936 \u0915\u0930\u093e\u0928\u0947 \u0915\u093e \u0935\u094d\u092f\u092f = 21,700 x 20 \u092a\u0948\u0938\u0947 = 4,34,000 \u092a\u0948\u0938\u0947 \u092f\u093e \u20b9 4,340<br \/>\n\u092c\u0941\u0915-\u0936\u0948\u0932\u094d\u092b \u0915\u0947 \u0906\u0928\u094d\u0924\u0930\u093f\u0915 \u092a\u0943\u0937\u094d\u0920 \u0915\u094b 3 \u092d\u093e\u0917\u094b\u0902 \u092e\u0947\u0902 \u091a\u093e\u0930 \u092a\u091f\u094d\u091f\u093f\u0915\u093e\u0913\u0902 \u0926\u094d\u0935\u093e\u0930\u093e \u092c\u093e\u0901\u091f\u093e \u0917\u092f\u093e \u0939\u0948\u0964<br \/>\n\u091a\u093e\u0930\u094b\u0902 \u092a\u091f\u094d\u091f\u093f\u0915\u093e\u0913\u0902 \u0915\u0940 \u091a\u094c\u0921\u093c\u093e\u0908 = 4 x 5 = 20 \u0938\u0947\u092e\u0940<br \/>\n\u092a\u094d\u0930\u0924\u094d\u092f\u0947\u0915 \u0916\u093e\u0928\u0947 \u0915\u0940 \u090a\u0901\u091a\u093e\u0908 = \\(\\frac { 110 &#8211; 20 }{ 3 }\\) = 30 \u0938\u0947\u092e\u0940<br \/>\n\u0914\u0930 \u092a\u094d\u0930\u0924\u094d\u092f\u0947\u0915 \u0916\u093e\u0928\u0947 \u0915\u0940 \u0906\u0928\u094d\u0924\u0930\u093f\u0915 \u0917\u0939\u0930\u093e\u0908 = 25 &#8211; 5 = 20 \u0938\u0947\u092e\u0940<br \/>\n\u092a\u094d\u0930\u0924\u094d\u092f\u0947\u0915 \u0916\u093e\u0928\u0947 \u0915\u093e \u0906\u0928\u094d\u0924\u0930\u093f\u0915 \u092a\u0943\u0937\u094d\u0920<br \/>\n= 2 [(75 x 20) + (30 x 20)] + (75 x 30) \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940 \u0939\u0948<br \/>\n= 2[ 1,500 + 600] + 2,250 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n= 4,200 + 2,250 = 6,450 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940\u0964<br \/>\n\u0938\u092e\u094d\u092a\u0942\u0930\u094d\u0923 \u092c\u0941\u0915-\u0936\u0948\u0932\u094d\u092b \u0915\u094b \u0906\u0928\u094d\u0924\u0930\u093f\u0915 \u092a\u0943\u0937\u094d\u0920 = 3 x 6,450 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940 = 19,350 \u0935\u0930\u094d\u0917 \u0938\u0947\u092e\u0940<br \/>\n\u092c\u0941\u0915-\u0936\u0948\u0932\u094d\u092b \u0915\u0947 \u0906\u0928\u094d\u0924\u0930\u093f\u0915 \u092a\u0943\u0937\u094d\u0920 \u092a\u0930 \u092a\u0947\u0902\u091f \u0915\u0930\u093e\u0928\u0947 \u0915\u093e \u0935\u094d\u092f\u092f = 19,350 x 10 \u092a\u0948\u0938\u0947 = 1,93,500 \u092a\u0948\u0938\u0947 = \u20b9 1,935<br \/>\n\u092c\u0941\u0915-\u0936\u0948\u0932\u094d\u092b \u0915\u094b \u0930\u0948\u0902\u0917\u0935\u093e\u0928\u0947 \u090f\u0935\u0902 \u092a\u0949\u0932\u093f\u0936 \u0915\u0930\u093e\u0928\u0947 \u0915\u093e \u0915\u0941\u0932 \u0935\u094d\u092f\u092f = (4,340 + 1,935) = \u20b9 6,275<br \/>\n\u0905\u0924\u0903 \u092c\u0941\u0915-\u0936\u0948\u0932\u094d\u092b \u0915\u094b \u0930\u0948\u0902\u0917\u0935\u093e\u0928\u0947 \u0914\u0930 \u092a\u0949\u0932\u093f\u0936 \u0915\u0930\u093e\u0928\u0947 \u0915\u093e \u0935\u094d\u092f\u092f = \u20b9 6,275<\/p>\n<p><strong>Ex 13.9 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 2.<\/strong><br \/>\n\u0915\u093f\u0938\u0940 \u0918\u0930 \u0915\u0947 \u0915\u092e\u094d\u092a\u093e\u0909\u0923\u094d\u0921 \u0915\u0940 \u0938\u093e\u092e\u0928\u0947 \u0915\u0940 \u0926\u0940\u0935\u093e\u0930 \u0915\u094b 21 \u0938\u0947\u092e\u0940 \u0935\u094d\u092f\u093e\u0938 \u0935\u093e\u0932\u0947 \u0932\u0915\u0921\u093c\u0940 \u0915\u0947 \u0917\u094b\u0932\u094b\u0902 \u0915\u094b \u091b\u094b\u091f\u0947 \u0906\u0927\u093e\u0930\u094b\u0902 \u092a\u0930 \u091f\u093f\u0915\u093e\u0915\u0930 \u0938\u091c\u093e\u092f\u093e \u091c\u093e\u0924\u093e \u0939\u0948, \u091c\u0948\u0938\u093e \u0915\u093f \u0906\u0915\u0943\u0924\u093f \u092e\u0947\u0902 \u0926\u093f\u0916\u093e\u092f\u093e \u0917\u092f\u093e \u0939\u0948\u0964 \u0907\u0938 \u092a\u094d\u0930\u0915\u093e\u0930 \u0915\u0947 \u0906\u0920 \u0917\u094b\u0932\u094b\u0902 \u0915\u093e \u092a\u094d\u0930\u092f\u094b\u0917 \u0907\u0938 \u0915\u093e\u0930\u094d\u092f \u0915\u0947 \u0932\u093f\u090f \u0915\u093f\u092f\u093e \u091c\u093e\u0928\u093e \u0939\u0948 \u0914\u0930 \u0907\u0928 \u0917\u094b\u0932\u094b\u0902 \u0915\u094b \u091a\u093e\u0901\u0926\u0940 \u0935\u093e\u0932\u0947 \u0930\u0902\u0917 \u092e\u0947\u0902 \u092a\u0947\u0902\u091f \u0915\u0930\u0935\u093e\u0928\u093e \u0939\u0948\u0964 \u092a\u094d\u0930\u0924\u094d\u092f\u0947\u0915 \u0906\u0927\u093e\u0930 1.5 \u0938\u0947\u092e\u0940 \u0924\u094d\u0930\u093f\u091c\u094d\u092f\u093e \u0914\u0930 \u090a\u0901\u091a\u093e\u0908 7 \u0938\u0947\u092e\u0940 \u0915\u093e \u090f\u0915 \u092c\u0947\u0932\u0928 \u0939\u0948 \u0924\u0925\u093e \u0907\u0928\u094d\u0939\u0947\u0902 \u0915\u093e\u0932\u0947 \u0930\u0902\u0917 \u0938\u0947 \u092a\u0947\u0902\u091f \u0915\u0930\u0935\u093e\u0928\u093e \u0939\u0948\u0964 \u092f\u0926\u093f \u091a\u093e\u0901\u0926\u0940 \u0915\u0947 \u0930\u0902\u0917 \u0915\u093e \u092a\u0947\u0902\u091f \u0915\u0930\u0935\u093e\u0928\u0947 \u0915\u0940 \u0926\u0930 25 \u092a\u0948\u0938\u0947 \u092a\u094d\u0930\u0924\u093f \u0938\u0947\u092e\u0940\u00b2 \u0924\u0925\u093e \u0915\u093e\u0932\u0947 \u0930\u0902\u0917 \u0915\u0947 \u092a\u0947\u0902\u091f \u0915\u0930\u0935\u093e\u0928\u0947 \u0915\u0940 \u0926\u0930 5 \u092a\u0948\u0938\u0947 \u092a\u094d\u0930\u0924\u093f \u0938\u0947\u092e\u0940\u00b2 \u0939\u094b \u0924\u094b \u092a\u0947\u0902\u091f \u0915\u0930\u0935\u093e\u0928\u0947 \u0915\u093e \u0915\u0941\u0932 \u0935\u094d\u092f\u092f \u091c\u094d\u091e\u093e\u0924 \u0915\u0940\u091c\u093f\u090f\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i0.wp.com\/farm2.staticflickr.com\/1868\/42678472200_d00b7918e4_o.png?resize=663%2C543&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.9 2\" width=\"663\" height=\"543\" data-recalc-dims=\"1\" \/><\/p>\n<p><strong>Ex 13.9 Class 9 \u0917\u0923\u093f\u0924\u00a0\u092a\u094d\u0930\u0936\u094d\u0928 3.<\/strong><br \/>\n\u090f\u0915 \u0917\u094b\u0932\u0947 \u0915\u0947 \u0935\u094d\u092f\u093e\u0938 \u092e\u0947\u0902 25% \u0915\u0940 \u0915\u092e\u0940 \u0939\u094b \u091c\u093e\u0924\u0940 \u0939\u0948\u0964 \u0909\u0938\u0915\u093e \u0935\u0915\u094d\u0930 \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 \u0915\u093f\u0924\u0928\u0947 \u092a\u094d\u0930\u0924\u093f\u0936\u0924 \u0915\u092e \u0939\u094b \u0917\u092f\u093e \u0939\u0948?<br \/>\n<strong>\u0939\u0932-<\/strong><br \/>\n\u092e\u093e\u0928\u093e \u0917\u094b\u0932\u0947 \u0915\u093e \u0935\u094d\u092f\u093e\u0938 d \u0939\u0948\u0964<br \/>\n\u0917\u094b\u0932\u0947 \u0915\u093e \u092a\u0943\u0937\u094d\u0920\u0940\u092f \u0915\u094d\u0937\u0947\u0924\u094d\u0930\u092b\u0932 = 4\u03c0 (\\(\\frac { d }{ 2 }\\))\u00b2 (\u2235 r = \\(\\frac { d }{ 2 }\\))<br \/>\n\u0917\u094b\u0932\u0947 \u0915\u0947 \u0935\u094d\u092f\u093e\u0938 \u092e\u0947\u0902 25% \u0915\u0940 \u0915\u092e\u0940 \u0939\u094b \u091c\u093e\u0924\u0940 \u0939\u0948\u0964<br \/>\n<img loading=\"lazy\" src=\"https:\/\/i1.wp.com\/farm2.staticflickr.com\/1877\/42678472300_d5f0ba56b1_o.png?resize=526%2C396&#038;ssl=1\" alt=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) 13.9 3\" width=\"526\" height=\"396\" data-recalc-dims=\"1\" \/><\/p>\n<p>Hope given NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes are helpful to complete your homework.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) These Solutions are part of NCERT Solutions for Class 9 Maths in Hindi Medium. Here we have given NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes. \u092a\u094d\u0930\u0936\u094d\u0928\u093e\u0935\u0932\u0940 13.1 Ex 13.1 Class 9 \u0917\u0923\u093f\u0924 \u092a\u094d\u0930\u0936\u094d\u0928 1. 1.5 \u092e\u0940\u091f\u0930 &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-9-maths-chapter-13-hindi\/\"> <span class=\"screen-reader-text\">NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium)<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":9,"featured_media":7733,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","spay_email":""},"categories":[6],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) - MCQ Questions<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-9-maths-chapter-13-hindi\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) - MCQ Questions\" \/>\n<meta property=\"og:description\" content=\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) These Solutions are part of NCERT Solutions for Class 9 Maths in Hindi Medium. Here we have given NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes. \u092a\u094d\u0930\u0936\u094d\u0928\u093e\u0935\u0932\u0940 13.1 Ex 13.1 Class 9 \u0917\u0923\u093f\u0924 \u092a\u094d\u0930\u0936\u094d\u0928 1. 1.5 \u092e\u0940\u091f\u0930 &hellip; NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) Read More &raquo;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-9-maths-chapter-13-hindi\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ Questions\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/NCERTSolutionsGuru\/\" \/>\n<meta property=\"article:published_time\" content=\"2021-07-23T03:13:25+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-03-02T04:55:56+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/mcq-questions.com\/wp-content\/uploads\/2019\/09\/NCERT-Solutions-for-Class-9-Maths-Chapter-13-Surface-Areas-and-Volumes-Hindi-Medium.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"720\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@ncertsolguru\" \/>\n<meta name=\"twitter:site\" content=\"@ncertsolguru\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Prasanna\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebSite\",\"@id\":\"https:\/\/mcq-questions.com\/#website\",\"url\":\"https:\/\/mcq-questions.com\/\",\"name\":\"MCQ Questions\",\"description\":\"MCQ Questions for Class 1 to 12\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/mcq-questions.com\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-9-maths-chapter-13-hindi\/#primaryimage\",\"inLanguage\":\"en-US\",\"url\":\"https:\/\/i1.wp.com\/mcq-questions.com\/wp-content\/uploads\/2019\/09\/NCERT-Solutions-for-Class-9-Maths-Chapter-13-Surface-Areas-and-Volumes-Hindi-Medium.png?fit=1280%2C720&ssl=1\",\"contentUrl\":\"https:\/\/i1.wp.com\/mcq-questions.com\/wp-content\/uploads\/2019\/09\/NCERT-Solutions-for-Class-9-Maths-Chapter-13-Surface-Areas-and-Volumes-Hindi-Medium.png?fit=1280%2C720&ssl=1\",\"width\":1280,\"height\":720,\"caption\":\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium)\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-9-maths-chapter-13-hindi\/#webpage\",\"url\":\"https:\/\/mcq-questions.com\/ncert-solutions-for-class-9-maths-chapter-13-hindi\/\",\"name\":\"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) - 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Here we have given NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes. \u092a\u094d\u0930\u0936\u094d\u0928\u093e\u0935\u0932\u0940 13.1 Ex 13.1 Class 9 \u0917\u0923\u093f\u0924 \u092a\u094d\u0930\u0936\u094d\u0928 1. 1.5 \u092e\u0940\u091f\u0930 &hellip; NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) Read More &raquo;","og_url":"https:\/\/mcq-questions.com\/ncert-solutions-for-class-9-maths-chapter-13-hindi\/","og_site_name":"MCQ Questions","article_publisher":"https:\/\/www.facebook.com\/NCERTSolutionsGuru\/","article_published_time":"2021-07-23T03:13:25+00:00","article_modified_time":"2022-03-02T04:55:56+00:00","og_image":[{"width":1280,"height":720,"url":"https:\/\/mcq-questions.com\/wp-content\/uploads\/2019\/09\/NCERT-Solutions-for-Class-9-Maths-Chapter-13-Surface-Areas-and-Volumes-Hindi-Medium.png","type":"image\/png"}],"twitter_card":"summary_large_image","twitter_creator":"@ncertsolguru","twitter_site":"@ncertsolguru","twitter_misc":{"Written by":"Prasanna","Est. reading time":"4 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebSite","@id":"https:\/\/mcq-questions.com\/#website","url":"https:\/\/mcq-questions.com\/","name":"MCQ Questions","description":"MCQ Questions for Class 1 to 12","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/mcq-questions.com\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"ImageObject","@id":"https:\/\/mcq-questions.com\/ncert-solutions-for-class-9-maths-chapter-13-hindi\/#primaryimage","inLanguage":"en-US","url":"https:\/\/i1.wp.com\/mcq-questions.com\/wp-content\/uploads\/2019\/09\/NCERT-Solutions-for-Class-9-Maths-Chapter-13-Surface-Areas-and-Volumes-Hindi-Medium.png?fit=1280%2C720&ssl=1","contentUrl":"https:\/\/i1.wp.com\/mcq-questions.com\/wp-content\/uploads\/2019\/09\/NCERT-Solutions-for-Class-9-Maths-Chapter-13-Surface-Areas-and-Volumes-Hindi-Medium.png?fit=1280%2C720&ssl=1","width":1280,"height":720,"caption":"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium)"},{"@type":"WebPage","@id":"https:\/\/mcq-questions.com\/ncert-solutions-for-class-9-maths-chapter-13-hindi\/#webpage","url":"https:\/\/mcq-questions.com\/ncert-solutions-for-class-9-maths-chapter-13-hindi\/","name":"NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes (Hindi Medium) - 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