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Additional recommended knowledge
Note: "km²" means (km)², square kilometre or kilometre squared, and not k(m²), kilo–square metre. For example, 3 km² is equal to 3 * (1,000 m)² = 3,000,000 m², not 3,000 m².
The 106 m² orders of magnitude page gives comparisons with geographic areas.
A hectare (104 m²) is less than a square kilometre which is less than a square megametre (1012 m²).
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Square_kilometre". A list of authors is available in Wikipedia.|