Question

Find the curved surface area of a right circular cone, whose slant height is $25$cm and the radius of the base is $7$cm.

Answer 1

Curved surface area of a right circular cone of height 'h', radius 'r' and slant height 'l' is given by $\pi rl$

For $r=7cm$, $l=25cm$

$\therefore$ Curved Surface area$=\pi rl$

$=\pi \times 7\times 25$

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

$=22\times 25$

$=550m^2$