# Spherical Cosine Rule for Angles

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Let be a spherical triangle on the surface of a unit sphere centered at . Let the arcs opposite the corresponding vertices be , , . Let , , be the angles at the vertices , , .

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Contributed by: Izidor Hafner (April 2017)

Open content licensed under CC BY-NC-SA

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Reference

[1] Wikipedia. "Spherical Law of Cosines." (Apr 5, 2017) en.wikipedia.org/wiki/Spherical_law_of _cosines.

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