A hectare is 10000 square metres. Metre is a unit of length (linear), and hectare is a unit of area, so you cannot determine how long a hectare is without knowing at least one other dimension.
A hectare is an area, not a length. 1 hectare is 10,000 square meters, or you can think of it as a square with sides 100 meters long
100 000 000 http://www.google.com.au/search?hl=en&q=1+hectare+in+square+centimeters&meta=
1 hectare (ha) is the area enclosed by a square of side length 100m.(1ha=10000 square meters)
10,000 square metres equals 1 hectare. Cubic metres would define a 3 dimensional object which a hectare does not describe.
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