See also
Girard's Spherical Excess Formula, Spherical Excess, Spherical Triangle
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References
Beyer, W. H. CRC Standard Mathematical Tables, 28th ed. Boca Raton, FL: CRC Press, p. 148, 1987.Zwillinger, D. (Ed.). CRC Standard Mathematical Tables and Formulae. Boca Raton, FL: CRC Press, p. 469, 1995.
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Cite this as:
Weisstein, Eric W. "L'Huilier's Theorem." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/LHuiliersTheorem.html