Question

The curved surface area and height of a cylinder are $110{cm}^2$ and $5cm$ respectively. Find the radius of a cylinder.

Answer 1

The curved surface area of a cylinder = $2\pi rh$

Here, $h=5cm$

So, $r=\frac{2\pi rh}{2\pi \times h}=\frac{110}{2\times \frac{22}{7}\times 5}=\frac{7}{2}cm$

$\therefore$ radius of the cylinder is $3.5cm$