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If the ratio of the circumference of the...

If the ratio of the circumference of the base of a right circular cone of radius r to its height is 3 : 1, then what is the area of the curved surface of the cone ?

A

A)`3pi r^(2)`

B

B)`(2pi r^(2)sqrt(4pi^(2) + 9))/(3)`

C

C)`(pi r^(2)sqrt(pi^(2) + 1))/(3)`

D

D)`(pi r^(2)sqrt(4pi^(2) + 9))/(3)`

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