Sides: 1,320'
Perimeter: 5,280'
Diagonal: 1,867'
Area: 1,742,400 square feet
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Answer: 1 acre = 43,560 ft²
One side of a 40-acre square is 1,320 feet.
It will be just under an acre. An acre contains 43,560 square feet. A closer dimension would be 210 by 210.
40 square rods = 1/4 acre.
20 by 20?