Concept information
Preferred term
law of cotangents
Definition(s)
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In trigonometry, the law of cotangents is a relationship among the lengths of the sides of a triangle and the cotangents of the halves of the three angles. Just as three quantities whose equality is expressed by the law of sines are equal to the diameter of the circumscribed circle of the triangle (or to its reciprocal, depending on how the law is expressed), so also the law of cotangents relates the radius of the inscribed circle of a triangle (the inradius) to its sides and angles.
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Law_of_cotangents)
Broader concept(s)
In other languages
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French
URI
http://data.loterre.fr/ark:/67375/PSR-TZMFBR04-Q
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