Question

The circumference of a circle is $39.6cm$. Find its area.
Use $\pi =\frac{22}{7}$

Answer 1

Circumference $=39.6cm$

$2\pi r=39.6$

$r=\frac{39.6\times 7}{2\times 22}$

$r=6.3cm$

Area $=\pi r^2$

$=\frac{22}{7}\times {6.3}^2$

$=124.74c{m}^2$