Question

The circumference of a circle is 39.6 cm. Find its area.

Answer 1

Given, the circumference = 39.6 cm.

$2\pi r=39.6$

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

$r=\frac{39.6}{44}\times 7=0.9\times 7=6.3$

Area = $\pi r^2=\frac{22}{7}\times (6.3{)}^2=124.6c{m}^2$