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Volume and Surface Area of Solid Figures

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  1. The ratio of the radii of two cylinders is 2 : 3 and the ratio of their heights is 5 : 3 . The ratio of their volumes will be ?
    1. 4 : 9
    2. 9 : 4
    3. 20 : 27
    4. 27 : 20
Correct Option: C

Let radii be 2r and 3r and heights be 5h and 3h.
∴ Ratio of volumes = [π(2r)2 x 5h] / [π(3r)2 x 3h]
= 20/27 = 20 : 27


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