1. Lesson 4

1.2. Explore

Mathematics 20-1 Module 2

Module 2: Trigonometry

 

Explore

 

The relationship you discovered in Try This 1 is called the sine law and is valid for all triangles—both right triangles and oblique triangles. The sine law is usually written in the following way:

 

 

The sine law can also be written as three separate equations:





This mathematical expression can be expressed in words as follows:

 

The length of a side divided by the sine of the opposite angle is the same for all side-angle pairs in any triangle.

 

This is a play button that opens Sine Law Illustrator.

Watch Sine Law Illustrator to see the sine law explained.



formula

Add the formula for the sine law to your copy of Formula Sheet.