What is the exact area of a circle with diameter 1 mile?

What is the exact area of a circle with diameter 1 mile?

 

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Formula for area of a circle = pi * (radius)^2

Diameter of circle is 1 mile, so radius of circle is 0.5 miles.

Hence, area of circle is pi * (0.5)^2 = 0.25pi mile^2
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