If S denotes the area of the curved surf...

If S denotes the area of the curved surface of a right circular cone of height h and semivertical angle `alpha` then S equals___

`Pih^2 tan^2 alpha`

`1/3Pih^2 tan^2 alpha`

`Pih^2 sec alpha tan alpha`

`1/3Pih^2 sec alpha tan alpha`

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