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The circumference of a circle is equal to $72\ \pi$. Find the radius of this circle.<
Given: The circumference of a circle is equal to $72\ \pi$.
To do: To find the radius of this circle.
Solution:
Let $r$ be the radius of the circle.
$\therefore$ The circumference of the circle $=2\pi r$
$\Rightarrow 2\pi r=72\pi$
$\Rightarrow r=\frac{72\pi}{2\pi}$
$\Rightarrow r=36\ m$
Thus, the radius is $36\ m$.
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