Question

The area of a circle is $616c{m}^2$. Find its circumference.

Answer 1

$A=\pi r^2=616$

$r^2=\frac{616}{22}\times 7$

$r^2=296$

$r=\sqrt{296}=14cm$

circumference$,2\pi r=2\times \frac{22}{7}\times 14$

$circumference=88cm$