16 (sq kilometers) = 3 953.6861 acres
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The answer is 16 000 acres.
One acre is equal to approximately 0.0016 square miles, and a standard football field is about 1.32 acres in size. Therefore, 22 acres would be equal to approximately 16.5 football fields.
1.7689
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.
Answer: 16 m² = 172.222 ft²