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Find the volume of a sphere whose diameter is $ 2.1\ m$.
Given:
The diameter of a sphere is $2.1\ m$.
To do:
We have to find the volume of the sphere.
Solution:
Diameter of the sphere $=2.1 \mathrm{~m}$
This implies,
Radius of the sphere $(r)=\frac{2.1}{2}$
$=\frac{21}{20} \mathrm{~m}$
Therefore,
Volume of the sphere $=\frac{4}{3} \pi r^{3}$
$=\frac{4}{3} \times \frac{22}{7} \times \frac{21}{20} \times \frac{21}{20} \times \frac{21}{20}$
$=\frac{4851}{1000}$
$=4.851 \mathrm{~m}^{3}$
$=4.85 \mathrm{~m}^{3}$
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