97 acres.
640 acres = 1 square mileI don't know what "square mile acre" means.
1 acre is 4840 square yards. 'Square acre' has no meaning
One square acre is defined as the area of a square of 1 acre X 1 acre. The area of a square is the length of its side multiplied by itself. For 100 square acres you could have a square of 10x10...
One acre.