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Use the following facts off the top of our head: 1 mile = 1.609344 kilometer, and 1 sq mile = 640 acres. Then: 1 mi2 = (1.609344)2 km2 = 2.59 km2 =640 acres and: 1 acre = 2.59/640 = 0.004047 km2 (rounded)

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Q: How many square km in an acre?
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