The perimeter of a square is four times the square root of its area, so the perimeter of a square one-acre area is four times the square root of an acre.
1 acre = 43560.17 ft2, so the square root of an acre is about
208.7 ft. The perimeter of the square is therefore
4 x 208.7 ft = 834.8 ft.
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Perimeter
The length around a flat figure or the sum of its sides.
For a flat shape, the 'perimeter' is the length of the piece of string you'd need to wrap around it exactly one time, and the 'area' is the whole place inside it, that you'd cover with paint or grass.
There is no perimeter of a circle. Only flat shapes have perimeters. You can however, find the circumference, surface area, and volume.
A flat round object is a circle. Surface area of a circle = pi*radius squared.