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GeoGebraGeoGebra Classroom

Angles in the 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.