Solving Oblique Triangles with the Law of Cosines

This video tutorial teaches how to solve non-right triangles using the law of cosines. It begins with an introduction to the law of cosines and a review of other triangle-solving methods like the Pythagorean theorem and the law of sines. The video explains the law of cosines formula and its notation, followed by two cases: finding an angle when all sides are known and finding a side when two sides and an included angle are given. The tutorial concludes with a caution to use the correct trigonometric law for different cases.

Explain how to find the missing side length when two sides and their included angle are given.

What is the approximate length of side MN?