Units of measurement
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Square millimeter (mm²)
Square nautical mile (nmi²)
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Square millimeter (mm²)
A square millimeter (mm²) is a unit of area equal to a square with sides of 1 mm. It is used in engineering and drafting for small areas.
Square nautical mile (nmi²)
A square nautical mile (nmi²) is a unit of area used in maritime navigation, equal to 3.43 km².