1.

The radii of two right circular cylinders are in the ratio 3 ∶ 4 and heights are in the ratio 4 ∶ 5. The ratio of their curved surface areas is:

A. 3 ∶ 5
B. 2 ∶ 5
C. 2 ∶ 3
D. 1 ∶ 3
Answer» B. 2 ∶ 5


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