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.
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A circle with a mile radius has an area of pi sq miles.
To find the area of a circle with a 10-mile radius, you can use the formula for the area of a circle, which is ( A = \pi r^2 ). Plugging in the radius, ( A = \pi (10)^2 = 100\pi ) square miles. This is approximately 314.16 square miles.
Area of a circle = pi R2 = 16 pi = 50.265 square miles (rounded)
Area of a circle = pi R2 = 9 pi = 28.27 square miles (rounded)