Question:
The curved surface area of a sphere is 5544 cm2. Find its volume.
Solution:
Let the radius of the sphere be $r$.
As,
Curved surface area of the sphere $=5544 \mathrm{~cm}^{2}$
$\Rightarrow 4 \pi r^{2}=5544$
$\Rightarrow 4 \times \frac{22}{7} \times r^{2}=5544$
$\Rightarrow r^{2}=5544 \times \frac{7}{4 \times 22}$
$\Rightarrow r^{2}=441$
$\Rightarrow r=\sqrt{441}$
$\Rightarrow r=21 \mathrm{~cm}$
Now,
Volume of the sphere $=\frac{4}{3} \pi r^{3}$
$=\frac{4}{3} \times \frac{22}{7} \times 21 \times 21 \times 21$
$=38808 \mathrm{~cm}^{3}$
So, the volume of the sphere is 38808 cm3..