Question

The curved surface area of a cylindar is $1980c{m}^2$ and the radius of its base is $15cm$. Find the height of the cylinder. $(\pi =\frac{22}{7})$

Answer 1

Curved surface area of cylinder = 1980

$\begin{array}{c}\Rightarrow 2\pi rh=1980\\ \Rightarrow 2\times \frac{22}{7}\times 15\times h=1980\\ \Rightarrow h=\frac{1980\times 7}{2\times 22\times 15}\\ \Rightarrow h=21cm.\end{array}$