834.8 feet.
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if you have a square acre how many ft. across is it
Perimeter (of a perfect square) is 4 times side length. The side length is acres, but an acre is area and we need distance. One acre has a side about 208.7 ft (if it is square). Therefore, 1565.25 ft is your side length. Back to perimeter: p= 4 (1565.25) Your perimeter is 6,261 ft.
1 acre = 43,560 square feet
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.
Assuming the shape of the parcel is a square, the perimeter length will be 1,181 feet. Since "acre" is an area of measure (43,560 sq ft) without set dimentions, the perimeter can be many different numbers.