Napier's rules

Napier's rules

[′nā·pē·ərz ‚rülz]
(mathematics)
Two rules which give the formulas necessary in the solution of right spherical triangles.
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This means that the trigonometric function of that part of the triangle must be changed to the co-function in Napier's rules (i.
A few example formulas generated by Napier's rules follow.