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A cylinder and a cone have equal radii of their bases and equal heights. Show that their volumes are in the ratio $3:1$.
Given:
A cylinder and a cone have equal radii of their bases and equal heights.
To do:
We have to show that their volumes are in the ratio $3:1$.
Solution:
Let $r$ be the radius and $h$ be the height of the cylinder and the cone.
Therefore,
Volume of the cylinder $= \pi r^2h$
Volume of the cone $=\frac{1}{3} \pi r^{2} h$
Ratio of the volumes of the cylinder and the cone $=\pi r^{2} h: \frac{1}{3} \pi r^{2} h$
$=1: \frac{1}{3}$
$=3: 1$
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