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Volume and Surface Area of Solid Figures

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  1. If the ratio of the diameters of two spheres is 3: 5, then what is the ratio of their surface areas ?
    1. 9 : 25
    2. 9 : 10
    3. 3 : 5
    4. 27 : 125
Correct Option: A

Let the diameter's of two sphere are d1 and d2, respectively.
∴ Ratio of their surface areas = 4πr12/4πr22
= (2r1)2/(2r2)2 = d12/d22
= (d1/d2)2 = (3/5)2 = 9/25 = 9 : 25


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