Question

The curved surface area of a right circular cylinder is $660{\text{cm}}^2$ and base radius is $5$ cm. Find its height.

Answer 1

Curved surface area of cylinder with radius $r$ and height $h$ is $=2\pi rh$

$\Rightarrow 2\pi rh=660$

$\Rightarrow h=\frac{660\times 7}{2\times 22\times 5}=21$cm.