Question

Find the circumference of a circle whose radius is $7$cm.

Answer 1

Fact: circumference of a circle whose radius is $r$ is given by $2\pi r$

Here $r=7$ cm

Hence circumference of the circle $=2\pi \left(7\right)=2\cdot \frac{22}{7}\cdot 7=2\cdot 22=44$ cm