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A length converter converts between metric (meters, km, cm, mm) and imperial (feet, inches, miles, yards) units. The metric system uses powers of 10; the imperial system uses irregular multipliers inherited from historical standards.

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1. 1The base SI unit is the meter (m)
2. 21 inch = 2.54 cm exactly (defined since 1959)
3. 31 mile = 5,280 feet = 1.609344 km
4. 41 foot = 12 inches = 30.48 cm

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