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The acre is a unit of land area used in the imperial and US customary systems. It is defined as the area of 1 chain by 1 furlong (66 by 660 feet), which is exactly equal to 1⁄640 of a square mile, 43,560 square feet, approximately 4,047 m2, or about 40% of a hectare.
Square zeptometre or Square zeptometer is a SI prefixes applied unit of area, symbol zm2, is a multiple of the of SI prefixes (zepto) used with the metre.