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From a solid cylinder whose height is 8 ...

From a solid cylinder whose height is 8 cm and of base radius 6 cm, a conical cavity of height 8 cm and of base radius 6 cm is formed by hollowing out. What is the inner surface area of the cavity ?

A

`6pi` square cm

B

`8pi` square cm

C

`10pi` square cm

D

`60pi` square cm

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