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A sphere, a cylinder and a cone have the...

A sphere, a cylinder and a cone have the same radius and same height then the ratio of their curved surface areas is ……….

A

`4 : 4 : sqrt 5`

B

`1 : 1 : sqrt 5`

C

`sqrt 5 : 4 : 4`

D

`4 : sqrt 5 : 4`

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