Information about the area is not enough to determine the perimeter.
640 acres is 1 sq mile. The smallest perimeter possible is if the area is in the shape of a circle and in that case the perimeter would be 3.54 miles = 18717 feet. If the area is a square the perimeter would be 4 miles = 21120 feet. If it is a rectangle, then any value greater than 4 miles.
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640 acres = 27,878,400 square feet.
the answer is clearly 86557485 mega tons
There are 640 acres in a section.
The parcel contains 27,878,400 square feet, equal to one square mile. Each side of the parcel measures one mile (5,280 feet). The perimeter length is 21,200 feet. The length of the diagonal is 7,470 feet.
One square mile is 640 acres.