Question

The volume of a cone is 18480 cm${}^3$. If the height of the cone is 40 cm. Find the radius of its base.

Answer 1

Let the radius of the cone be $r$ cm.

$h=40$ $cm$

$Volume,V=18480$ $c{m}^3$

$\frac{1}{3}\times \frac{22}{7}\times r^2\times 40=18480$

$r^2=441$

$r=21$ $cm$