![]() 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). ![]() An acre is about 0.405 hectares and one hectare contains about 2.47 acres. There are 100 hectares in one square kilometre. The hectare ( / ˈ h ɛ k t ɛər, - t ɑːr/ SI symbol: ha) is a non-SI metric unit of area equal to a square with 100- metre sides (1 hm 2), or 10,000 m 2, and is primarily used in the measurement of land. ![]()
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