None.
A rod 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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640 acres, algebraic steps below: 1 mi²*640 acres 1 mi²=640 acres
One square mile is equal to 640 acres of water.
There are 640 acres in 1 square mile.
One square mile equates to 640 acres.
Answer: 640 acres = 1 square mile.