The radius and height of a cone are in the ratio 4:3. The area of the base is `154 c m^2dot` Find the area of the curved surface.

Explanation

let `r=4x`

`h=3x`

then `l=5x`

since The area of the base `=154cm^2`

`pir^2=154cm^2`

or, (22/7)xx(4x)^2=154`

`x=7/4`

so`r=4xx(7\4)=7cm`

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