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UPSC 2017 CDS II Math Paper

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Question : 74

Total: 100

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 ?

6π square cm
8π square cm
10π square cm
60π square cm

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