None.
A foot 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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About 10 (9.8842153) acres in 40,000m2
20.89 acres.
40000 feet = 7.6 miles
How many acres are 310 feet * 630 feet
About 17.2 acres.