Answer:
1 mi² = 640 acres
Explanation:
1 mi = 5280 ft
1 mi² = 5280 ft × 5280 ft = 27,878,400 ft²
1 acre = 43,560 ft²
1 mi² / 1 acre = 27,878,400 ft² / 43,560 ft² = 640
Therefore, 1 mi² = 640 acres.
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