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Volume and Surface Area of Solid Figures

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  1. The radii of two spheres are in the ratio 1 : 2 . The ratio of their surface areas is ?
    1. 1 : 2
    2. 1 : 4
    3. 1 : √2
    4. 3 : 8
Correct Option: B

Let their radii be x and 2x .
Ratio of their surface areas = [4πx2]/[4π(2x)2] = 1/4 = 1 : 4


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