Trigonometry starts with a study of right triangles and the relationships between ratios of sides. From there, the unit circle can be discussed and trigonometric functions defined. The lessons below cover these different topics.
The basics
Right-triangle trigonometry
- Defining and Using the Trigonometric Functions with Right Triangles
- How to Memorize the Definitions of the Trig Functions
Evaluating trig functions
Identities
Downloads
- Blank Table of the Common Angles (for practice)