Ex 11.4, 7 - Chapter 11 Class 9 Surface Areas and Volumes

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Ex 11.4, 7 Find the volume of a sphere whose surface area is 154 cm2 Let radius of the sphere = r cm Given, Surface area = 154 cm2 4 r2 = 154 4 22/7 r2 = 154 r2 = (154 7)/(4 22) r2 = 12.25 r = 12.25 r = 3.5 cm Volume of sphere = 4/3 r3 = (4/3 22/7 3.5 3.5 3.5) cm3 = 179.67 cm3

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo