What is Acre?
:''For the state in Brazil, see [[Acre (state)]].'' An '''acre''' is the area of a [[rectangle]], whose length is one [[furlong]] and width one chain. Acre is an [[England|English]] [[unit]] of [[area]], which is also used in the [[United States]] and some [[Commonwealth of Nations|Commonwealth]] countries. It is most often used to describe areas of land. * By the official definition it is 4,046.8564224 m<sup>2</sup> (4,840 [[square yard]]s). It is the area of one [[furlong]] by one [[chain_(unit)|chain]]. * The ''international acre'' is 4,046.8564224 m<sup>2</sup>, or 0.404686 [[hectare]]s. This is based on ''international foot'' of 0.3048 m. * The length of the side of a square, whose area is one acre, is 209.71 feet. An acre is approximately equal: * the area of an [[American football]] field. Originally, it was seen as the area of land a [[farmer]] could [[plough]] with an [[ox]] in a day. Since this definition depended on the farmer and the ox, it looked variable. Therefore, [[Edward I of England|Edward I]], [[Edward III of England|Edward III]], [[Henry VIII of England|Henry VIII]] and [[George IV of England|George IV]] passed laws fixing its size. The Commonwealth countries, including the United States then also introduced these laws. ==Other websites== * [http://www.opsi.gov.uk/si/si1995/Uksi_19951804_en_2.htm The Units of Measurement Regulations 1995] * [http://ts.nist.gov/ts/htdocs/230/235/appxc/appxc.htm NIST Handbook 44] {{Webarchive|url=https://web.archive.org/web/20041204052555/http://ts.nist.gov/ts/htdocs/230/235/appxc/appxc.htm |date=2004-12-04 }} {{math-stub}} [[Category:Units of area]]