Question

Find the volume and surface area of a sphere of radius $2.1cm$. $(\pi =\frac{22}{7})$

Answer 1

Radius of sphere, $r=2.1cm$
Volume of sphere $=\frac{4}{3}\pi r^3$
$=\frac{4}{3}\times \frac{22}{7}\times (2.1{)}^3=38.8c{m}^3$

Surface area of sphere $=4\pi r^2$

$=4\times \frac{22}{7}\times 2.1\times 2.1=55.44c{m}^2$