Question

The area of the base of a right circular cylinder is $81\pi$ ${cm}^2$ and height of the cylinder is $14cm$. Find its curved surface.

Answer 1

Base area of a cylinder = $\pi r^2=81\pi \Rightarrow r=9cm$

Height of cylinder = $h=14cm$

Curved surface area of cylinder = $2\pi rh=2\times \frac{22}{7}\times 9\times 14=792c{m}^2$

$\therefore$ The curved surface area of the cylinder is $792c{m}^2$.