If the radius of base of a cone and a cylinder are equal, the curved surface areas are also equa...

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If the radius of base of a cone and a cylinder are equal, the curved surface areas are also equal, then the ratio of the slant height of the cone to the height of the cylinder. is
a. \( 2: 1 \)
b. \( 2: 3 \)
c. \( 1: 3 \)
d. \( 3: 1 \)
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