1 are is 100 square meters. 1 hectare (10,000 sq meters) = 2.471 acres. So 1 are is one hundredth of a hectare = 0.02471 acre.
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1 ha = 2.47 acres
1 Square Kilometer = 247.105381467165 Acres
There are 40 acres in 1/16th of a square mile 1 square mile = 640 acres
Answer: 1 km² = 247.105 acres
50.9 acres approx.