# math

how do i find the area of a circle with a diameter of 2mi

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1. The area A of a circle is usually given in terms of the radius, r as
A = πr²

Engineers usually measure the diameter of a circle/cylinder to find the area, so they use a formula expressed in terms of the diameter, d:
A = πd²/4

Both with give the same answer. In your case, the diameter is 2 mi (miles).
If you apply the second formula, the area you get will be in terms of square miles.

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