Lesson 4
1. Lesson 4
1.2. Explore
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:
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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. |
Watch Sine Law Illustrator to see the sine law explained.
Add the formula for the sine law to your copy of Formula Sheet.