Main content

### Course: Algebra 2 > Unit 11

Lesson 1: Unit circle introduction# Unit circle

Learn how to use the unit circle to define sine, cosine, and tangent for all real numbers. Created by Sal Khan.

## Want to join the conversation?

No posts yet.

If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains ***.kastatic.org** and ***.kasandbox.org** are unblocked.

Main content

Learn how to use the unit circle to define sine, cosine, and tangent for all real numbers. Created by Sal Khan.

No posts yet.