Question

Find the area of a circle of diameter $8.4m.$

Answer 1

As we know that,

Area of circle $=\pi r^2$

Whereas $r$ is the radius of circle.

Diameter of circle $=8.4m\left(\text{Given}\right)$

Radius of circle $=\frac{8.4}{2}=4.2m$

Therefore,

Area of the circle $=\frac{22}{7}\times 4.2\times 4.2=22\times 4.2\times 0.6=55.44m^2$