Ex 11.2, 6 - Chapter 11 Class 9 Surface Areas and Volumes

Last updated at Dec. 13, 2024 by

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Ex 11.2 , 6 Assume = 22/7, unless stated otherwise. Find the radius of a sphere whose surface area is 154 cm2. Let r be the radius of the sphere. Surface area = 4 2 154 cm2 = 4 2 154 cm2 = 4 22/7 2 154 7/(22 4) cm2 = 2 2 = 12.25 r = 12.25 r = 3.5 Thus, the radius of the sphere is 3.5 cm

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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