Question

The slant side of a right circular cone is $10$ m and its height is $8$ m. Find the area of its curved surface $(\pi =31.4)$.

Answer 1

$l=10m,h=8m$
$\therefore$ $r=\sqrt{l^2-h^2}=6m$
$\therefore$ Curved surface area
$=\pi rl$
$3.114\times 6\times 10=188.4m^2$