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283,131 sq miles
If you have a circular area with a 50-mile radius, the area of the circle is approximately 7,854 square miles (rounded).
It is 502655 sq miles, approx.
500 miles!
That depends whether the "10-mile circle" refers to the circle's radius, its diameter, or its circumference. Assuming it is the diameter, divide it by 2 (to get the radius), then use the formula: area = pi x radius2.