Hectare

A hectare (symbol ha) is a metric unit of area. It is not an SI unit, but it is accepted (although discouraged) for use with the SI. The SI unit of area is the square metre.

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1 ha = 10 000 m²

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Metric: Metric has several meanings:...

SI: The International System of Units (abbreviated SI from the French phrase, Syst?me International d'Unit?s) is the most widely used system of units. It is the most common system for everyday commerce in the world, and is almost universally used in the realm of science....

Metre: :This article is about the unit of length. For other uses of metre or meter, see meter (disambiguation)....