**Spherical Law of Cosines - Mathematical and Statistical**
http://www.math.ucdenver.edu/~hartkes/teaching/2011m896/SphericalLawOfCosines.pdf

Spherical Law of Cosines WewilldevelopaformulasimlartotheEuclideanLawofCosines.LetXYZ beatriangle,with anglesa,V,c andoppositesidelengthsa,b,c asshownintheﬁgure. X a b c Y Z a c V Theorem (LawofCosinesfortheEuclideanplane). c2 = a2 +b2 2abcosc. NowassumethatourtriangleXYZ isonaunitsphere, withanglesa,V,c andsidelengths a,b,c. …

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