Question
A hollow spherical metallic ball has an external
diameter 6cm and is 1/2cm thick. The volume of the ball (in cm cube) is.Solution
Given- Diameter = 6cm R = 3cm, r = 3-1/2=5/2 cm Volume of the ball = 4 π /3[R3-r3] = (4/3) ×22/7 [27-125/8] = 88/21 [(216-125)/8] = (88/21) ×91/8 =143/3 cm3
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