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One hectare = 10,000 m2 So if one side is 40 meters, then the other side (presuming it's a rectangle) is 10,000/40
It can only become well defined when you specify what constitutes a big person. Is it over 1.8 metres for example, or over 125 kg? or some other measure.
A hectare is a unit of area. A metre is a unit of length. The two units are therefore incompatible.
800 square meters is 8,611.1 square feet.
You do not specify if the 8 mm is the circumference, diameter or radius. Please clarify.