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26 August, 18:22

If a sphere's radius is quadrupled, what is the corresponding change in surface area?

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  1. 26 August, 20:44
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    The surface area of a sphere is four times the area of the largest circle that can be formed out of it. Mathematically, the surface area SA = 4 πr^2. There is a direct variation between the surface area and radius.

    SA = 4 π (4r) ^2

    SA = 64 πr^2

    Thus, the surface area is multiplied 16 times if the radius is quadrupled.
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