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Defining the Coterminal Angle

Angles are not only from 0 to 360 degrees. Angles can formed from any size degree - large, small, and even negative! Use the worksheet below to discover how these angles relate to the angles from 0 to 360. With this applet, use the slider to explore angles from -2880 to 2880 degrees. Notice the value of the slider angle α' and α. These two angles are <strong>coterminal</strong>. To examine the Greatest Negative Coterminal Angle, click of check box.
This applet can be used by teachers in demonstration mode in the classroom or teachers can have students load it on their own computers with a worksheet to be complete for a grade.