Question

Find the radius of a circle if its circumference is $308cm$.

Answer 1

Circumference of circle$=2\mathrm{\pi r}$ , where $r$ is radius.

Radius of circle$=\frac{\mathrm{Circumference}\mathrm{of}\mathrm{circle}}{2\mathrm{\pi }}$

Radius of circle$=\frac{308\times 7}{2\times 22}=49cm$

Hence, radius of circle is $49cm$.