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A solid is in the shape of a cone standing on a hemisphere with both their radii being equal to 1 cm and the height of the cone is equal to its radius. Find the volume of the solid in terms of $\pi$.
Given:
A solid is in the shape of a cone standing on a hemisphere with both their radii being equal to 1 cm and the height of the cone is equal to its radius.
To do:
We have to the volume of the solid in terms of $\pi$.
Solution:
Radius of the hemisphere $=1 \mathrm{~cm}$
Height of the conical part
$=1 \mathrm{~cm}$
This implies,
Total height of the solid $=1+1=2 \mathrm{~cm}$
Therefore,
Volume of the solid $=$ Volume of the conical part $+$ Volume of the hemispherical part
$=\frac{1}{3} \pi r^{2} h+\frac{2}{3} \pi r^{3}$
$=\frac{1}{3} \pi r^{2}(h+2 r)$
$=\frac{1}{3} \pi \times(1)^{2}[1+2 \times1]$
$=\frac{\pi}{3} \times 1 \times 3$
$=\pi \mathrm{~cm}^{3}$
The volume of the solid is $\pi\ cm^3$.
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