Law of Sine

Law of Sine is one of the many things a student learns in Pre-Calculus, and some even learn it in Geometry. Law of sine is very simply put as:
                                                    a                b                  c
                                                _____    =   _____  =   _______
                                                 CosA         Cos B          CosC

The lower case letters mean the side lengths of a triangle. The capital letters are angle measurements. To know that you're using Law of Sine, your problem must first involve a triangle. It also has to have at least 1 side length and two angles or 1 angle and 2 side lengths. Let's take a look at Example 1 to see how you can use this formula to find a side length.

This is how you use Law of Sine to solve for a side length, but now I'm going to show you how to use it to solve for an angle measurements.

This is how you solve a problem using law of sine. Watch for the next post over law of cosine.