Question:
The circumference of the base of a cylinder is 88 cm and its height is 15 cm. Find the volume of the cylinder.
Solution:
Let $r \mathrm{~cm}$ be the radius of a cylinder.
Circumference of the cylinder, $S=2 \pi r$
Given :
Height, $h=15 \mathrm{~cm}$
Circumference, $S=88 \mathrm{~cm}$
$\mathrm{S}=2 \pi \mathrm{r}$
$88=2 \times \frac{22}{7} \times \mathrm{r}$
$r=\frac{88 \times 7}{44}$
r = 14cm
Volume of cylinder, $V=\pi r^{2} h$
$=\frac{22}{7} \times 14^{2} \times 15$
$=9240 \mathrm{~cm}^{3}$