Current time:0:00Total duration:9:04

0 energy points

# Unit circle

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

If you're seeing this message, it means we're having trouble loading external resources for Khan Academy.

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

Main content
# Unit circle

Current time:0:00Total duration:9:04

0 energy points

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