None.
An acre is a measure of area so that a square acre is a measure in 4-dimensional hyperspace. By comparison, a hectare is merely a measure of area in 2 dimensional space. The two differ in their dimensionality and so, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
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There are2.47105381 acres in 1 hectare.
1 hectare = 2.4710538147 acres
About 4046.86 square meters. 10,000 square meters is a "hectare" (100 x 100 in simplest sizes). A hectare is about 2.47 acres.
1 hectare = 10,000 square meters
1 hectare = 10,000 sq m