Square kilometre

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A square kilometre (sometimes written km²) is based on the SI unit of measurement of area, the square metre. It is the area inside a square that has each side equal to 1 kilometre (1000 metres). This way of talking about area is often used to say how much land there is, on a farm or in a city, for example.

One square kilometre is just less than 0.39 square miles.