notes/education/math/MATH1060 (trig)/Law of Cosines.md

The Law of Cosines is useful when solving for SAS or SSS triangles.

 a^2 = b^2 + c^2 -2bc\cos(\alpha) 

 b^2 = a^2 + c^2 -2ac\cos(\beta) 

 c^2 = a^2 + b^2 -2ab\cos(\gamma) 

• When using the Law of Cosines to solve for SSS triangles, start solving for the largest angle.
• When correctly solved, the smallest angle will be opposite the smallest side, and the largest angle will be opposite the largest side.