mm (millimeters)
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The same units that you use for length and distance. For example, the SI unit would be the meter.
Metres and centimetres. Or feet and inches. Then square any measurements to find the area.
Standard units are more commonly used than non standard units. Also, many of the conversion factors, such as the Universal Gravitational Constant or the Speed of Light, are in standard units and, if your measurements were not in appropriate units, you would need to convert.
You would use kilograms (kg) to measure someone's mass in metric units.
I would measure it in maters