Question

The diameter of the base of a right circular cylinder is 20 m and its height is 21 m. Find its curved surface area.

• A. 210 $m^2$
• B. 1320 $m^2$
• C. 660 $m^2$
• D. 1300 $m^2$

Answer 1

The correct option is B 1320 $m^2$

Given: Height of the cylinder = 21 m
Diameter of the cylinder = 20 m
$\Rightarrow$ Radius of the cylinder = $\frac{20}{2}$ = 10 m
Curved surface area of cylinder = $2\pi rh$
= $2\times \frac{22}{7}\times 10\times 21$
= $1320m^2$