Ex 11.2, 2 (ii) - Chapter 11 Class 9 Surface Areas and Volumes

Last updated at August 14, 2026 by

Ex 11.2, 2 (ii) - Find surface area of sphere with diameter 21 cm - Ex 11.2

 

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Ex 11.2, 2 Assume = 22/7, unless stated otherwise. Find the surface area of a sphere of diameter: (ii) 21 cm Radius of sphere = r = /2 = (21/2) cm = 10.5 cm Surface area of sphere = 4 r2 = (4 22/7 10.5 10.5)cm2 = 1386 cm2

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