Hectare is a unit of area and mm is a unit of length. These 2 cannot be directly associated without knowing the shape and likely another dimension. This is because area is a squared unit (i.e. metres squared, mm squared etc).
Impossible to say, millimetres are lineal and hectare is area.
I hectare = 10 decares
1 hectare = 2.471 acres
1 hectare = 0.01 km2
Two acres is about 0.81 hectare.
There are 100 sections in a hectare. Each section is equivalent to 1/100th of a hectare.
One hectare is 10,000 metres square.
One Hectare has precisely 15.4375Bighas
1 hectare 10000 m2 ⇒ 41551.71 hectare = 41551710 m2
1 Hectare = 2.47105381 Acres
One hectare is 10,000 m2
2.471 acres per hectare