Units of measurement
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Square millimeter (mm²)
Acre (ac)
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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.
Acre (ac)
An acre (ac) is a traditional land measurement unit in the US and UK, equal to 4046.86 m² (approximately 0.4 ha).