Question

The curved surface area of a right circular cone of base radius $5$ and vertical height $12$ is

Answer 1

$l=\sqrt{5^2+{12}^2}㎝$

$=13㎝$

Curved surface area of core$=\pi Rl㎠$

$=\pi \times 5\times 13㎠$

$=65\pi ㎠$