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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 volume is increased by ?
    1. 100 %
    2. 200 %
    3. 700 %
    4. 800 %
Correct Option: C

Original volume = 4/3πr3
New volume = 4/3 π (2r)3 = 32/3 πr3
Required increased % = [(28/3) πr3] x [(3/4)πr3] x 100 % = 700 %


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