Q 3030512412.     A piece of paper in the shape of a sector of a circle of radius `10cm` and of angle `216^{\circ}` just covers the lateral surface of a right circular cone of vertical angle ` 2\theta` .Then ` \sin\: \theta` is

A

`3/5`

B

`4/5`

C

`3/4`

D

None of these

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