Units of measurement
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Square millimeter (mm²)
Square rod (rd²)
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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 rod (rd²)
A square rod (rd²) is an old British unit of area, equal to 25.29 m² or 1/160 acre.