Question

Find approximately the volume of the sphere of radius $1.001$.

Answer 1

Radius (r) $=1.0001$
Volume of the sphere $=\frac{4}{3}\pi r^3$
$=\frac{4}{3}\times \frac{22}{7}\times 1.0001\times 1.0001\times 1.0001$
$\approx \mathrm{4.203060......}$
$\approx 4.20$