Units of measurement
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Square inch (in²)
Hectare (ha)
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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).
Hectare (ha)
A hectare (ha) is widely used in agriculture and land registry, equal to 10,000 m² (100×100 m).