Question

The perimeter of the base of a cone is $44cm$ and the slant height is $25cm$. Find the curved surface of the cone.

Answer 1

According to the problem :

Given that

Circum ference of base cone is $44cm$

Slant height is $25cm$

Ccircum ference of cone $=$ $2\pi r$

$44=2\times \frac{22}{7}\times r$

$r=7cm$

Therefore,

Curued surface area of cone is $\pi rl$

$=\frac{22}{7}\times 7\times 25$

$=550c{m}^2$