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The radius of the base of a cone is 4cm ...

The radius of the base of a cone is 4cm and the height is 3cm. Its CSA is `( pi = ( 22)/( 7))` `:`

A

20 `cm^(2)`

B

`20 pi cm^(2)`

C

`30 pi cm^(2)`

D

None of these

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The correct Answer is:
B
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