90 metres by 40 metres = 3,600 square metres
3,600 square metres = 0.88957937328 acre
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1 square = approx 9.28 sqm 40 squares = approx 371.2sqm
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.
400 meters by 200 meters is about 19.8 acres.
1000 (square meters) = 0.247105381 acres
45,000 square meters = 11.12 acres.