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A circle with a mile radius has an area of pi sq miles.
The formula for the area of a circle is: 3.14 (pi) times the radius squared. A circle with a 40 mile radius would have an area of 3.14 x 40 x 40 = 5024 square miles.
Area of a circle = pi R2 = 9 pi = 28.27 square miles (rounded)
Area of a circle = pi R2 = 16 pi = 50.265 square miles (rounded)