Question

The formula for the volume of a cylinder is $V=\pi r^{2}h$, where $\pi =\frac{22}{7}$.
Find $r$, when $h=14$ and $V=396$.

Answer 1

$V=\pi r^{2}h$

$396=\frac{22}{7}\times r^2\times 14$

$\frac{396}{44}=r^2$

$9=r^2$

$\therefore r=3$