Question

Find the circumference and area of circle having radius $4.2cm.$

Answer 1

Given, radius $r=4.2$ cmradius(r)=4.2cm

Circumference of the circle $=2\pi r$
$=2\times \frac{22}{7}\times 4.2$

$=26.4cm$

Area of the circle $=\pi r^2$
$=\frac{22}{7}\times 4.2\times 4.2$

$=55.44c{m}^2$