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A cone hemisphere and a cylinder stand on the same base and have equal height find the ratio of their curved surface area

A. 

l: h: r

B. 

l:2h:r

C. 

l:2h:2r

D. 

2l:2h:2r

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Answer with explanation

Answer: Option C

Explanation

Given,
cone,hemisphere and cylinder have same base and equal height.

curved surface area of cone=πrl
curved surface area of cylinder=2πrh
curved surface area of hemisphere=2πr²

ratio=CSA of cone: CSA of hemisphere:CSA of cylinder
=πrl:2πrh:2πr²
=l:2h:2r

 

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