john mercer wrote: >How many Hectares are there in a square kilometer? 1 hectare = 100 m * 100 m 1 square kilometre = 1000 m * 1000 m = 100 hectare
The hectare is a non-SI unit. The official status is "not encouraged". http://www.bipm.org/pdf/si-brochure.pdf I presume that you could call a square kilometre a hectohectare, and a square metre 0.1 millihectares.
