Question

If the radius of the circle is $14\mathrm{cm}$, find its circumference.

Answer 1

Write the formula for circumference of circle and substitute the given values.

Circumference of circle $=2\mathrm{\pi r}$

$$\begin{gathered} =2\mathrm{\pi r} \\ =2\times \frac{22}{7}\times 14 \\ =2\times \frac{22}{1}\times 2[14\mathrm{gets}\mathrm{cancelled}\mathrm{by}7] \\ =44\times 2 \\ =88\mathrm{cm} \end{gathered}$$

Hence, $88\mathrm{cm}$is the circumference of the circle.