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A: Acres are measured in square feet, and there are 43,560 square feet in 1 acre. If the acre of land is perfectly square, each side will be just under 209 feet long. To calculate square footage in order to determine if a square piece of land is 1 or more acres, measure two sides and multiply the numbers together.
A square mile is 5280 feet on all 4 sides. Multiply 5280 x 5280, and divide the result by 640... THAT is how many square feet there are in an acre. An acre can have any dims., as long as when calculated you come out with the required number of square feet..