None.
An acer is a tree (the maple, for example) whereas a square mile is a measure of area.
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1 square mile = 640 acres
1 square mile = 640 acres 6 square miles = 3,840 acres
The would be an area of 160 acres.
640 acres in a square mile
1 mile = 5,280 ft (5,280 ft x 5,280 ft) = 27,878,400 sq ft = 1 square mile = 640 acres (1 'section') 1 acre = (27,878,400 / 640) = 43,560 sq ft