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Question

The surface area of a sphere is 2464 cm2. If its radius be doubled, what will be the surface area of the new sphere?

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Solution

The surface area of a sphere is given by 4πr2

So, it is proportional to the square of the radius.

If the radius is doubled, surface area will become 4 times.

New surface area = 4×2464=9856 cm2


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