Law of Sin by HP

[Albert Chan]

Dieter just answer your question earlier ...

(08-03-2018 06:08 PM)Dieter Wrote:  It should read sin(X)/A = sin(Y)/B = sin(Z)/C.

While we are on the subject on triangle, Law of Cosine formula is not suited for needle-like triangle.
Prof. Kahan had the answer (see example 5) : Miscalculating Area and Angles of a Needle-like Triangle

c² = a² + b² - 2ab*cosC = (a-b)² + 4ab*(sin(C/2))² = (a-b)² + 4Δ tan(C/2)

Triangle area, Δ = ½ ab sinC