A hectare (ha) is a unit of area used primarily to measure land area. It is equal to 10.000 square meters (m²), 2,471 acres (approximately), 0,01 square kilometers (km²). The term "hectare" is composed of the Greek words "hekton" meaning "hundred" and "aroura" meaning "acre". It was introduced as a metric unit in the 19th century to replace the traditional acre, which was based on the British imperial system.
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