**Acre - Wikipedia**
https://en.wikipedia.org/wiki/Acre

The acre is a unit of land area used in the imperial and US customary systems. It is traditionally defined as the area of one chain by one furlong (66 by 660 feet), which is exactly equal to 10 square chains, 1ā640 of a square mile, 4,840 square yards, or 43,560 square feet, and approximately 4,047 m , or about 40% of a hectare. Based upon the International yard and pound agreement of 1959, an acre may be declared as exactly 4,046.8564224 square metres. The acre was sometiā¦

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