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The area of a circle is given by the formula A = πr^2, where A is the area and r is the radius.
Substituting the given radius of 2.1 miles into the formula, we get:
A = 3.14 * (2.1)^2
A = 3.14 * 4.41
A ≈ 13.834
Therefore, the estimated area of the circle is 13.83 square miles.