Question

Find the volume of the right circular cone with
(i) radius $6cm$, height $7cm$.
(ii) radius $3.5cm$, height $12cm$

Answer 1

$\left(i\right)$ radius $=6$cm, $h=7$cm
Volume $=\frac{1}{3}\pi r^{2}h=\frac{1}{3}\times \frac{22}{7}\times 6\times 6\times 7$
$=44\times 6=264$cm${}^3$
$\left(ii\right)$ $r=3.5$cm, $h=12$
Vol $=\frac{1}{3}\pi r^{2}h=\frac{1}{3}\times \frac{22}{7}\times 3.5\times 3.5\times 12$
$=154$cm${}^3$