Question

The radius of the base of a right circular cylinder is $5$ $cm$ and height is $21$ $cm$, find the curved surface area.

Answer 1

The radius of the base of a right circular cylinder is $5$ $cm$ and height is $21$ $cm$.
Here, $r=5$ $cm$ and $h=21$ $cm$.
Curved surface area of cylinder $=2\pi rh$
$=2\times \frac{22}{7}\times 5\times 21$
$=44\times 15$
$=660{cm}^2$
$\therefore$ The curved surface area of cylinder is $660{cm}^2$.