Precalculus: The Law of Cosines

Covers the Law of Cosines and how it helps solve SAS (side-angle-side), SSS (side-side-side), and AAA (angle-angle-angle) non-right triangles. Concludes with a summary of solving non-right triangles using both the Law of Sines and the Law of Cosines.

0:00 Page 1 The Law of Cosines formulas
3:10 Page 2 Solving SAS triangles
12:36 Page 3 Solving SSS triangles
15:52 Page 4 Solving AAA triangles
18:02 Page 5 Finding an angle of a triangle in the xy-plane
20:11 Page 6 Summary of solving non-right triangles