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Trafalgar Square has an area of about one hectare.[1]

A hectare is a unit of measurement. It measures the area of something, most often the area of land, or of very large buildings. It is equal to 10,000 square metres, or a rectangle with sides of 100 by 100 metres. It is equal to 2.47 acres. 100 hectares is one square kilometre. Therefore, a farm with 200 hectares of fields has 2 square kilometers of fields.

The word hectare means 100 ares. Hecto is the metric system prefix meaning 100 times. Are is a metric system unit of measure for area, equal to 100 square metres.

A square plot of land with 100–metre length for a side, is one hectare. It is about the size of a European football field.