対訳 ラジアン
出典:Wiktionary
出典:『Wiktionary』 (2025/12/01 21:57 UTC 版)
出典:Wikipedia
出典:『Wikipedia』 (2011/07/23 23:44 UTC 版)
Radian is the ratio between the length of an arc and its radius. The radian is the standard unit of angular measure, used in many areas of mathematics. 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.
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