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Volume and Surface Area of Solid Figures

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  1. If radius of a sphere is decreased by 24%, by what per cent does its surface area decrease ?
    1. 44%
    2. 49%
    3. 42.24%
    4. 46.2%
Correct Option: C

According to the formula,
Percentage decrease in surface area = [2 x (-24) + (-24) x (-24)/100]%
= [-48 + 5.76]% = - 42.24%


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