The metric unit commonly used to measure the area of a city is square kilometers (km²). For smaller areas or detailed measurements, square meters (m²) might also be used, but for the overall size of a city, square kilometers are the standard unit.
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m Square
The metric unit used to measure the area of a door is typically square meters (m²) or square centimeters (cm²).
SI unit for area is meter square. Other unit is yard.
kilograms