Question

Find the volume and surface area of a sphere of radius $8.4cm$. $(\pi =\frac{22}{7})$

Answer 1

Radius of sphere, $r=8.4cm$
Volume of sphere $=\frac{4}{3}\pi r^3$
$=\frac{4}{3}\pi \times (8.4{)}^3$
$=\frac{4}{3}\times \frac{22}{7}\times (8.4{)}^3$
$=2483.712c{m}^3$
Surface area of sphere $=4\pi r^2$
$=4\times \frac{22}{7}\times (8.4{)}^2$
$=887.04c{m}^2$.