Question

The area of a circle is $98.56c{m}^2$. Find its circumference.

Answer 1

Area of circle = $\pi r^2$

$98.56c{m}^2=\frac{22}{7}\times r^2$

$r^2=98.56\times \frac{7}{22}$

$r^2=31.36$

$r=5.6cm.$

circumference of circle $=2\times \pi \times r=2\times \frac{22}{7}\times 5.6=35.2cm$