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Let C be a right-circular cone. It is gi...

Let C be a right-circular cone. It is given that the two ends of a frustum of C are of radii 3 cm and 6 cm, and the height of the frustum is 9 cm.
What is the total surface are of the given frustum?

A

`9pi(2sqrt(10)+5)"cm"^(2)`

B

`9pi(3sqrt(10)+5)"cm"^(2)`

C

`9pi(3sqrt(10)+4)"cm"^(2)`

D

`27pi(sqrt(10)+1)"cm"^(2)`

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