1 sq mile = 640 acres
area circle = π × radius²
= π × (2.5 miles)²
= π × 6.25 sq miles
= π × 6.25 × 640 acres
= 4000π acres
≈ 12,566 acres.
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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.
If you have a circular area with a 50-mile radius, the area of the circle is approximately 7,854 square miles (rounded).
If the area is a circle with a four-mile circumference, the area in acres is: 814.72 acres.
1 mile * 35 ft = 4.2424.. acres.
An acre is a unit of area, and a linear mile is a measure of length, so they cannot really be compared. However, if you mean a square mile, there are 640 acres to a square mile.