1.

A right circular cone is sliced into a smaller cone and a frustum of a cone by a plane perpendicular to its axis. The volume of the smaller cone and the frustum of the cone are in the ratio 64 ∶ 61. Then their curved surface areas are in the ratio

A. 4 ∶ 1
B. 16 ∶ 9
C. 64 ∶ 61
D. 81 ∶ 64
Answer» C. 64 ∶ 61


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