Hectometre is not commonly used in everyday language, more frequent in technical or scientific contexts. That forest area covers several hectometres.
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Metric System
Hectometre is part of the metric system, which is based on multiples of ten. The park's walking path is marked every hectometre.
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Visualization
Imagine a soccer field, approximately a hectometre (100 meters) helps in visualizing the unit's length. Two soccer fields end-to-end are just about two hectometres long.