1 square = approx 9.28 sqm
40 squares = approx 371.2sqm
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40 acres is 400 square chains.
Meters is a measure of length and acres a measure of area, so they are not interchangeable. However, if what you mean is 1,640 square meters, such as a rectangle measuring 40 meters by 41 meters, then the answer is 0.40525282561 of an acre.
90 metres by 40 metres = 3,600 square metres 3,600 square metres = 0.88957937328 acre
40 square meters are 430.556417 square feet.
40 square meters = 430.56 square feet.