Angles in the Unit Circle
- Author:
- Alfonso Garcia, Malin Christersson
- Topic:
- Angles, Circle, Unit Circle
Drag the red point!
About the Unit Circle
This applet shows a circle with a radius = 1 unit.
As you move the red point, you will see a right triangle with a central angle (vertex at the origin, one arm on the x-axis and the other created when you move the point).
We will use this circle to understand trigonometric ratios for angles in all quadrants.