Question

The radius and slant height of a cone is $10$cm and $26$cm, find its volume.

Answer 1

Radius$10$cm, Slant height$=l=26cm$, $v=?,h=?$
Height$=h=\sqrt{l^2-r^2}=\sqrt{{26}^2-{10}^2}=\sqrt{676-100}=\sqrt{576}=24cm$
Volume$=\frac{1}{3}\pi r^{2}h=\frac{1}{3}\times \pi \times 10\times 10\times 24=2514.28c{m}^3$