None.
A metre is a measure of length or distance while an acre is a measure of area. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
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400 meters by 200 meters is about 19.8 acres.
80 acres = 3,484,800 square feet.
0.1469 acres, approx.
1000 (square meters) = 0.247105381 acres
45,000 square meters = 11.12 acres.