Question

Find the area of the circle, whose radius is $4.2cm$.

Answer 1

We know that,

Area of circle=$\pi r^2$

$\begin{array}{c}=\frac{22}{7}\times 4.2\times 4.2\\ =\frac{22\times 6\times 42}{100}\\ =\frac{5544}{100}\\ =55.44c{m}^2\end{array}$

Hence,

Area of the circle is $55.44c{m}^2$.