Question

The area of a circle is 1386 sq. cm, find the value of its circumference.

Answer 1

Area=$\pi$$\times$r${}^2$

1386= $\pi$$\times$r${}^2$

r=21 cm

Circumference=2$\pi$$\times$r

= 2$\times$$\pi$$\times$21

= 132 cm