# Unit Circle - Exact Values of Trigonometric Ratios

- Author:
- John Sweeney

- Topic:
- Circle, Ratios, Unit Circle

A

**unit circle**, a circle of radius 1 centered at the Origin, contains many patterns involving coordinates of points on the circle, as well as central angles of the circle. Drag the blue dot around the green unit circle to help you discover some of these patterns. Then answer the questions below.