The radius and slant height of a cone are in the ratio of 4:7. If its curved surface area is `792\ c m^2,` find the radius. `(U s e\ pi=(22)/7)`

Explanation

let radius and slant height of cone`=4x,7x`

curved surface area`=792cm^2`

`pirl=792cm^2`

`pixx(4x)(7x)=792`

`x=3`

so radius`r=4xx3=12cm`