Question

The area of a circle is 15400 m2. Find its circumference ​

Answer 1

area =

$\pi {r}^{2}$

=15400

r =

$\sqrt{15400 (7 \div 22)}$

: r = 70 m

now

circumference =

$2\pi r$

= 2 ×22/7×70

= 440

hence circumference is 440 m