Spherical Law of Cosines/Also known as

Spherical Law of Cosines: Also known as

Some sources refer to the Spherical Law of Cosines as just:

the cosine-formula
the cosine law
the cosine rule
the rule of cosines
the law of cosines

but all of these are also used to refer to the plane version, so on $\mathsf{Pr} \infty \mathsf{fWiki}$ this is not recommended.

Some sources carefully refer to it as the law of cosines for spherical triangles.


Sources

  • 1968: Murray R. Spiegel: Mathematical Handbook of Formulas and Tables ... (previous) ... (next): $\S 5$: Trigonometric Functions: $5.97$
  • 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): cosine rule (law of cosines): 2.
  • 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): cosine rule (law of cosines): 2.
  • 2008: Ian Stewart: Taming the Infinite ... (previous) ... (next): Chapter $5$: Eternal Triangles: Early trigonometry
... where he misattributes it to Georg Joachim Rhaeticus
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