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Radius, height, slant height of a cone a...

Radius, height, slant height of a cone are r, h, l, then 'l' value in terms of r and h is ….

A

`sqrt(h^2-r^2)`

B

`sqrt(r^2+h^2)`

C

`sqrt(r^2-h^2)`

D

`sqrt(4r^2+h^2)`

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