Question

The area of a circle of circumference $132cm$ is_______ $cm²$.

Answer 1

Step 1: To calculate the radius of circle

Circumference of circle $=2\mathrm{\pi r}$

Radius of circle$=\frac{Circumference}{2\mathrm{\pi }}$

Radius of circle$=\frac{132}{2\times {\displaystyle \frac{22}{7}}}=21cm$

Step 2: To calculate the area of circle

Area of circle$=\mathrm{\pi }{\mathrm{r}}^2$

Area of circle$=\frac{22}{7}\times 21\times 21=1386c{m}^2$

Hence area of circle is equal to $1386c{m}^2$