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When the diameter of a sphere is decreased by 25 percent by what per cent does its curved surface area decrease?
Wiki User
∙ 14y ago
Surface area, S.A., of a sphere with radius r equals to 4pir2.
Since the diameter is decreased by 25%, the radius is also decreased by 25%.
That is r - 0.25r = 0.75r.
So that S.A. = 4pi(0.75r)2 = 2.25pir2
Wiki User
∙ 14y ago
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