Question

The curved surface area of a right circular cylinder of height $21cm$ is $957{cm}^2$. Find the diameter of the base of the cylinder.

Answer 1

CSA of cylinder =$2\pi rh$

$\Rightarrow 2\times \frac{22}{7}\times r\times 21=957$

$\Rightarrow r=\frac{957\times 7}{2\times 22\times 21}=7.25cm$

$\Rightarrow d=2r=14.5cm$