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.
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If you have a circular area with a 50-mile radius, the area of the circle is approximately 7,854 square miles (rounded).
The area doesn't tell you the perimeter.-- If the square mile is inside a circle, then the perimeter (circumference) is 3.545 miles.-- If the square mile is inside a square, then the perimeter is 4.000 miles.-- If the square mile is inside rectangle that's 2 miles long and 1/2 mile wide,then the perimeter is 5.000 miles.-- If the square mile is inside a rectangle that's 10 miles long and 0.1 mile wide,then the perimeter is 20.2 miles...etc.The area doesn't tell you the perimeter.
Miles measures distance. Square miles measures area. Therefore, you can not compare the two.
283,131 sq miles
A 12-mile line has an area of 0 square miles. A 12x12 mile square area has an area of 144 square miles, if that's what you meant. When you're talking about area, you need a length and a width.