Question
The radius of a sphere is 12cm. The surface of the
sphere is what percent of its volumeSolution
Given r = 12cm Surface area of sphere = 4πr22 Volume of sphere =4/3 πr3 According to question  = (4πr2)/(4/3 πr3 )  ×100  = 3/r×100   = 3/12×100  = 1/4×100  =25%
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