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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.
Best Answer: An acre is approximately 211 ft x 211 ft it is a square unit of measure. One acre comprises 4,840 square yards, 43,560 square feet. A mile is 5,280 ft long it is a linear unit of measure. If you want to know measurements of an acre in square miles it is 211/5280 x 211/5280 square miles. An acre is much much smaller than a square mile. If you want to know how many acres in a square mile take the inverse of that small number 1/x.