Kilometre

A kilometre (American spelling: kilometer), symbol: km is a unit of length in the metric system equal to 1000 metres (from the Greek words ????? (khilia) = thousand and ????? (metro) = count/measure). It is approximately equal to 0.621 miles, 1094 yards or 3281 feet.

Metric system

:Main articles: Metric system and Metre

Related Topics:
Metric system - Metre

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Like the kilometre, all units of length in the metric system are based on the metre, by adding an SI prefix that stands for a power of ten, such as hecto for one hundred to form hectometre (= 0.1 kilometre) or mega for one million to form megametre (= 1,000 kilometre).

Related Topics:
SI prefix - Hectometre - Megametre

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The metre is not only the basis for all units of length in the metric system, but also of units of area (the square metre) and volume (the cubic metre). This extends to the kilometre, so one can have square and cubic kilometres.

Related Topics:
Length - Area - Square metre - Volume - Cubic metre

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Unicode has symbols for "km" (㎞), for square kilometre (㎢) and for cubic kilometre (㎦); however, they are useful only in CJK texts, where they are equal in size to one Chinese character.

Related Topics:
Unicode - CJK - Chinese character

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