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If the perimeter of a circle is equal to that of a square, then find the ratio of their areas.
Given: The perimeter of a circle is equal to that of a square.
To do: To find the ratio of their areas.
Solution:
As given the perimeter of the circle is equal to that of the square.
$P_{circle}=P_{square}$
Let $r$ be the radius of the circle & $a$ be the side of square, then
$2\pi r=4a$
$\frac{r}{a}=\frac{4}{2\pi}=\frac{2}{\pi}$
Now, $\frac{Area\ of\ the\ circle}{Area\ of\ the\ square}=\frac{\pi r^2}{a^2}$
$\Rightarrow \frac{Area\ of\ the\ circle}{Area\ of\ the\ square}=\frac{\pi\times2^2}{\pi^2}$
$=\frac{4}{\pi}$
Hence the ratio of Area of a circle to that of a square is $\frac{4}{\pi}$.
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