Units of measurement
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Square millimeter (mm²)
Rood (rood)
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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.
Rood (rood)
A rood is an old British unit of area measurement, equal to 1/4 acre (1011.71 m²).