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Ex 13.4, 2 - Chapter 13 Class 9 Surface Areas and Volumes - Part 2

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Ex 13.4, 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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