Ex 13.4, 2 - Chapter 13 Class 9 Surface Areas and Volumes - Part 3

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Ex 11.2, 2 Assume = 22/7, unless stated otherwise. Find the surface area of a sphere of diameter: (iii) 3.5 cm Radius of sphere = r = /2 r = (3.5/2) cm = 1.75 cm Surface area of sphere = 4 r2 = (4 22/7 1.75 1.75)cm2 = 38.5 cm2

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