The diameters of two cones are equal. If their slant heights are in the ratio 5:4, find the ratio of theri curved surfaces.

Explanation

Given : Diameters of two cones are equal.

So, their radius will also be the same.

Let radius = r

Let the slant height of two cones are `l^'` and `l^''`

Ratio of C.S.A of two cones = `pirl^'`/pirl^''`

`A^'/A^'' = 5/4`

Hence, the ratio of their curved surface area is `5:4`.