<P> In 1795, when the metric system was introduced, the "are" was defined as 100 square metres and the hectare ("hecto -" + "are") was thus 100 "ares" or ​ ⁄ km . 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 units, mentioned in Section 4.1 of the SI Brochure as a unit whose use is "expected to continue indefinitely". </P> <P> The name was coined in French, from the Latin ārea . </P> <Table> Comparison of area units <Tr> <Th> Unit </Th> <Th> SI </Th> </Tr> <Tr> <Td> 1 ca </Td> <Td> 1 m </Td> </Tr> <Tr> <Td> 1 a </Td> <Td> 100 m </Td> </Tr> <Tr> <Td> 1 ha </Td> <Td> 10,000 m </Td> </Tr> <Tr> <Td> 100 ha </Td> <Td> 1,000,000 m 1 km </Td> </Tr> <Tr> <Th_colspan="2"> non-SI comparisons </Th> </Tr> <Tr> <Th> non-SI </Th> <Th> metric </Th> </Tr> <Tr> <Td> 0.3861 sq mi </Td> <Td> 1 km </Td> </Tr> <Tr> <Td> 2.471 acre </Td> <Td> 1 ha </Td> </Tr> <Tr> <Td> 107,639 sq ft </Td> <Td> 1 ha </Td> </Tr> <Tr> <Td> 1 sq mi </Td> <Td> 259.0 ha </Td> </Tr> <Tr> <Td> 1 acre </Td> <Td> 0.4047 ha </Td> </Tr> </Table> <Tr> <Th> Unit </Th> <Th> SI </Th> </Tr>

1 square km is equal to how many hectare
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