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Volume and Surface Area of Solid Figures

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  1. If the radius of a sphere is doubled, then its surface area is increased by ?
    1. 100%
    2. 200%
    3. 300%
    4. 50%
Correct Option: C

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


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