Question

A right triangle ABC with sides 5 cm, 12 cm and 13 cm is revolved about the side 12 cm. Find the volume of the solid so obtained.

Answer 1

Solid so obtained is a cone with $r=5$ & $h=12$

$\Rightarrow$ Volume $=\frac{1}{3}\pi r^{2}h=\frac{\pi }{3}\times 25\times 12=100\pi c{m}^2$.