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0112/2///62720#UAA966radian  

定义

  • The radian is the standard unit of angular measure, used in many areas of mathematics. It describes the plane angle subtended by a circular arc as the length of the arc divided by the radius of the arc. In the absence of any symbol radians are assumed, and when degrees are meant the symbol $^{\\ circ}$ is used.

上位概念

注释,说明

  • The radian and steradian are special names for the number one that may be used to convey information about the quantity concerned. In practice the symbols rad and sr are used where appropriate, but the symbol for the derived unit one is generally omitted in specifying the values of dimensionless quantities.
  • The radian is the standard unit of angular measure, used in many areas of mathematics. It describes the plane angle subtended by a circular arc as the length of the arc divided by the radius of the arc. The unit was formerly a SI supplementary unit, but this category was abolished in 1995 and the radian is now considered a SI derived unit. The SI unit of solid angle measurement is the steradian. The radian is represented by the symbol "rad" or, more rarely, by the superscript c (for "circular measure"). For example, an angle of 1.2 radians would be written as "1.2 rad" or "1.2c" (the second symbol is often mistaken for a degree: "1.2u00b0"). As the ratio of two lengths, the radian is a "pure number" that needs no unit symbol, and in mathematical writing the symbol "rad" is almost always omitted. In the absence of any symbol radians are assumed, and when degrees are meant the symbol u00b0 is used. [Wikipedia]

其它语言

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    波兰语

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    罗马尼亚语

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    马来语

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    葡萄牙语

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    斯洛文尼亚语

  • radyan

    土耳其语

  • רדיאן

    希伯来语

  • ακτίνιο

    希腊语

  • 西班牙语

  • radián

    匈牙利语

  • 意大利语

  • वर्ग मीटर

    印地语

  • 弧度

    中文

URI

https://vocab.sentier.dev/units/unit/RAD

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