Kilometres measure length. Hectares measure area. Your question is like saying, how many metres in a football field.
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1 hectare = 0.01 sq kilometers.
1 hectare = 0.01 square kilometers
A kilometre is a unit of distance. A hectare is a unit of area. The two units are therefore incompatible.
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The hectare is ten thousand square metres, so: 1/10000 ha = 1 m2