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An acre, a unit of land measurement still in wide use, has a length of one furlong 11 mi2 and a width one-tenth of its length. 8 (a) How many acres are in a square mile? (b) How many square feet are in an acre? (c) An acre-foot is the volume of water that would cover 1 acre of flat land to a depth of 1 foot. How many gallons are in 1 acre-foot?