![]() ![]() Some countries that underwent a general conversion from traditional measurements to metric measurements (e.g. However, the United Kingdom, United States, Burma, and to some extent Canada use the acre instead. ![]() It is widely used throughout the world for the measurement of large areas of land, and it is the legal unit of measure in domains concerned with land ownership, planning, and management, including law ( land deeds), agriculture, forestry, and town planning throughout the European Union and In practice the hectare is fully derived from the SI, being equivalent to a square hectometre. The name was coined in French, from the Latin ārea. The hectare ( / ˈ h ɛ k t ɛər, - t ɑː r/ ), although not a unit of SI, is the only named unit of area that is accepted for use with SI units. Trafalgar Square has an area of about one hectare. Though the dekare/decare daa (1,000 m 2) and are (100 m 2) are not officially "accepted for use", they are still used in some contexts. The hectare, however, remains as a non-SI unit accepted for use with the SI and whose use is "expected to continue indefinitely". When the metric system was further rationalised in 1960, resulting in the International System of Units ( SI), the are was not included as a recognised unit. In 1795, when the metric system was introduced, the are was defined as 100 square metres, or one square decametre, and the hectare (" hecto-" + "are") was thus 100 ares or 1⁄ 100 km 2 (10,000 square metres). Enda's GAA ground, Omagh: the playing field used in the Gaelic games of Gaelic football and hurling is a little over a hectare in size.
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