208.7103256 feet x 4
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The perimeter of a 72-acre square is 7,080 feet or 1.34 miles.
An acre is a unit of area, but its actual shape may vary. It doesn't have to be shaped like a square. The more oblong the shape, the greater the perimeter becomes. If it is a perfect square, however, then its perimeter in feet will be four times the square root of its area in square feet. An acre is equal to 43,560 square feet. The square root of that is 208.71, so the perimeter is 834.84 feet if the acre is square. The minimum value of perimeter for a given area will always occur with a circular shape. Area = Pi x d2/4, perimeter = Pi x d, so for 1 acre perimeter comes to 739.9 ft.
An acre is an area itself, so a 'square acre' doesn't mean anything. The circumference or perimeter depends on the shape of the acre. The smallest value will be for a circle. For an acre which is a perfect square shape, each side equal, the perimeter is 278.3 yards or 834.9 feet
A 12-acre square lot has a perimeter of 2,891.96 feet.
A 20-acre square lot has a perimeter of 3,733.52 feet.