How Many Square Feet in 1 Acre?

In Imperial and US customary unit system, Acre is a unit of area. One acre contains 43,560 square foot or 4,046.85 square meter or 4,840 square yards. 1 foot equals to 12 inches and 3 feet makes one yard.One square foot equals to 144 square inches or 1/9 square yards or 98903.04 square millimeters. You can find more information here: http://en.wikipedia.org/wiki/Acre
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