The document discusses the Law of Cosines, which can be used to solve non-right triangles when two angles and any side are known (AAS or ASA), or when two sides and the included angle are known (SAS). It provides examples of how to apply the Law of Cosines in these two cases, as well as examples from the textbook. The document also outlines a two-day lesson plan to teach students how to use the Law of Cosines and determine when to use it versus the Law of Sines.