The Law of Cosines - Concept

Concept Concept (1)

One method for solving for a missing length or angle of a triangle is by using the law of cosines. The law of cosines, unlike the law of sines, is similar to the Pythagorean theorem, but it works for all triangles, not just right triangles. In order to understand how to use the law of cosines effectively, one must understand the cosine function and inverse trigonometric functions.

Sample Sample Problems (2)

Need help with "The Law of Cosines" problems? Watch expert teachers solve similar problems to develop your skills.

The Law of Cosines - Problem 1
Problem 1
How to use the law of cosines to find a missing side in a triangle.
The Law of Cosines - Problem 2
Problem 2
How to use the law of cosines to find a missing angle given three sides in a triangle.