An acre is 208.75 feet on a side. So your formula is 208.75 times 208.75, times 40 for 40 acres. You multiply it out. Or you can try 5,280 time 5,280 divided by 640, since there are 640 acres in a square mile. Then you multiply by 40 for 40 acres. Or you could simply divide by 16 the first time. There is a slight difference between the two, but since it is impossible to have a flat piece of land on a round earth, the measurement of an acre is imprecise.
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40 acres.
Answer: 40 acres = 1,742,400 square feet.
0.40 acres is an area of 17,424 square feet.
Each side of a square with an area of 40 acres is 1,320 feet (1/4 mile) long. The diagonal measurement is 1,867 feet long.
A square parcel of land with an area of 40 acres will measure 1,320 feet (1/4 mile) on each side.