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If the radius of a sphere is doubled, then its surface area is increased by?

100%
200%
300%
50%

Correct Answer: 300%

Explanation:

Original area = 4π r²,
New area = 4π(2r)² = 16 π r²
Required increased % = [12πr²]/[4π r²] x 100 %= 300%

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