As an acre is a measure of area (a 2-dimensional object), a square acre is a 4-dimensional object; visualising 4-dimensional objects is not easy in our 3-dimensional space.
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Assuming you meant a square area which is 9 acres in size, then:
1 acre = 4840 sq yds
→ 9 acres = 9 × 4840 sq yds = 43560 sq yds
→ a square with an area of 9 acres has a side length of √43560 yards ≈ 208.71 yards (perimeter of approx 834.84 yards)
An area of 9 acres can have any shape you want. The smallest perimeter is when the 9 acres is circular in shape, in which case the perimeter is the circumference of the circle with area of 9 acres and is approx 739.86 yards long. Any other shape will have a perimeter that is longer than this.
Other examples are a rectangle 9 yards wide and 4840 yards long (perimeter 9699 yards);
a rectangle 198 yards wide (9 chains) by 220 yards long (1 furlong) (perimeter 836 yards).
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You don't have to figger: a square acre has a perimeter of 208.7 fett on all four sides. But you can find the square root of the 43560 square feet inside an acre to get the perimeter measuremnets.
If the lot has an area of 1 acre, and the shape is a square (acre is the area unit, not square acre). 1 acre = 43560 ft², so take the square root and get 208.71 ft side length.
figure it out
Area has the dimension of (length)2. So square feet, square yards, square miles, square meters, square centimeters; are all units describing an area. A hectare is an area unit equal to 10000 square meters, and an acre is an area unit equal to 43560 square feet.
An acre is 66 x 660 feet. Or any other rectangle (or other figure) with the same number of square feet, since it is a unit of area.An acre is 66 x 660 feet. Or any other rectangle (or other figure) with the same number of square feet, since it is a unit of area.An acre is 66 x 660 feet. Or any other rectangle (or other figure) with the same number of square feet, since it is a unit of area.An acre is 66 x 660 feet. Or any other rectangle (or other figure) with the same number of square feet, since it is a unit of area.