Hectare
Hectare
!Image comparing the hectare (the small blue area at lower left) to other units. The entire yellow square is one [square mile.](//upload.wikimedia.org/wikipedia/commons/thumb/7/7e/Comparisonofunitsofarea.png/250px-Comparisonofunitsofarea.png)
Hectare
!St. Enda's GAA ground, in [Omagh. The playing field used in Gaelic football and hurling is a little over a hectare in size.](//upload.wikimedia.org/wikipedia/commons/thumb/a/a8/St.Enda%27sGAAground%2COmagh-geograph.org.uk-556880.jpg/250px-St.Enda%27sGAAground%2COmagh-geograph.org.uk-556880.jpg)
Hectare
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 km2 (10000 square metres). 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. The hectare, however, remains as a non-SI unit accepted for use with the SI and whose use is "expected to continue indefinitely". Though the dekare/decare daa (1000 m2) and are (100 m2) are not officially "accepted for use", they are still used in some contexts.
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