Question

Find the radius of a circle whose area is $616c{m}^2.$

Answer 1

Let the radius of the circle be ${}^{\prime }{r}^{\prime }$ cm.

$\therefore$ Area of the circle $=\pi r^{2}c{m}^2$

$\therefore \pi r^2=616$

$\Rightarrow \frac{22}{7}\times r\times r=616$

$\Rightarrow r^2=616\times \frac{7}{22}=196$

$\Rightarrow r=\sqrt{196}=14cm$

Hence, the radius of the given circle is $14cm.$