A hollow spherical metallic ball has an external diameter 12cm and is 3/2cm thick. Find the surface area of the ball (in cm2) is.
Given- Diameter = 12cm R = 6cm, r = 6-3/2=9/2 cm Surface area of the ball = 4 π [R3-r3] = 4 ×22/7 [216-729/8] = 88/7 [(1728-729)/8] = (88/7) ×999/8 = (11×999)/7= 1569.8cm2
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