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10 June, 15:16

If the diameter of sphere is reduced by half, its surface becomes A. one-quarter the original surface. B. double the original surface. C. half the original surface. D. four times the original surface.

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  1. 10 June, 18:58
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    Surface area is 4*pie*r^2

    If the diameter is reduced by half, radius is reduced by half

    New radius is r'

    r' = r/2

    So new area = 4*pie*r'^2 = pie * r^2

    So A
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