A Semi-circular piece of paper of radius...

A Semi-circular piece of paper of radius r cm. is folded to form a cone. The volume of the cone thus formed is …… `cm^(3)`.

A

`(pi r^(3))/(sqrt(3))`

B

`(pi r^(3))/(8sqrt(3))`

C

`(pi r^(3))/(2sqrt(3))`

D

`(pi r^(3))/(4sqrt(3))`

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