Units of measurement
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Square inch (in²)
Square millimeter (mm²)
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Square inch (in²)
A square inch (in²) is a unit of area in the British and American measurement systems, equal to a square with a side of 1 inch (2.54 cm).
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.