Question

Find the circumference of a circle whose area is $301.84c{m}^2$

Answer 1

Let $r$ be the radius of the circle.

Now, area $=\pi r^2=301.84$

$\Rightarrow \frac{22}{7}{r}^2=301.84$

$\Rightarrow r^2=96.04$

$\Rightarrow r=9.8cm$

Hence, circumference $=2\pi r=2\times \frac{22}{7}\times 9.8=61.6cm$