Acre
Unit of area
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The acre is a unit of land area used in the British imperial and the United States customary systems. Wikipedia
Footage: 43,560 square feet
SI units: = 4,046.8564224 m2
Unit of: area
Unit system: US customary units, Imperial units
US customary, Imperial: ≡ 4,840 sq yd; ≡ 1⁄640 sq mi