Units of measurement
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Square inch (in²)
Square chain (ch²)
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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 chain (ch²)
A square chain (ch²) is a British unit of area measurement equal to 404.69 m² or 1/10 acre.