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

Last updated at May 29, 2023 by

Ex 13.4, 6 - Find radius of a sphere whose surface area - Area Of Sphere

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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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