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It's not. Or rather, that's only one of them, and there are several others.

1 foot = 12 inches

1 yard = 3 feet

1 rod = 5.5 yards or 16.5 feet

1 furlong = 40 rods or 220 yards or 660feet

1 mile = 5,280 feet, 1,760 yards, 320 rods, 8 furlongs

1 square foot = 144 square inches

1 square yard = 9 square feet, 1,296 square inches

1 acre = 43,560 square feet, 4,840 square yards

1 square mile = 640 acres

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Q: Why is imperial measurement a unit of 12?
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