Question:
Find the volume of a sphere whose radius is:
(i) 2 cm
(ii) 3.5 cm
(iii) 10.5 cm.
Solution:
(i) Radius (r) = 2 cm
Therefore volume $=4 / 3 \pi r^{3}$
$=4 / 3 \times 22 / 7 \times(2)^{3}$
$=33.52 \mathrm{~cm}^{3}$
(ii) Radius (r) = 3.5 cm
Therefore volume $=4 / 3 \pi r^{3}$
$=4 / 3 \times 22 / 7 \times(3.5)^{3}=179.666 \mathrm{~cm}^{3}$
(iii) Radius (r) = 10.5 cm
Therefore volume $=4 / 3 \pi r^{3}$
$=4 / 3 \times 22 / 7 \times(10.5)^{3}=4851 \mathrm{~cm}^{3}$