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Consider an acre to be a square of side x miles. 640x2 = 1 So x = sqrt(1/640) = about 0.0395 miles or 70 yards. 1 square mile = 5280 x 5280 = 27,878,400 ft2 27,878,400/640 = 43,560 ft2 √ 43,560 = 208.71 ft = the length of the sides of a square acre However, an acre is a measure of land, originally used for farmland. It follows that it is easier to imagine rectangular acres: divide a square mile lengthwise by eight and widthways by eighty: you thus end up with strips of land 660 feet long and 66 feet wide.

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Q: What are the dimensions of a square acre of ground if 1 square mile equals 640 acres?
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