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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 slant height of the given frustum?

A

`3sqrt(10)` cm

B

`6sqrt(10)` cm

C

12 cm

D

15 cm

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