Definition 1: Two angles are coterminal if - when drawn in standard position - they share a terminal side.

Example: 60°, -300°, and 780° are all coterminal.

Interactivity 1: Coterminal Angles   Directions for interactivity

Click and drag the slider button to change the number of turns.

Select the box Standard Angle to see the coterminal angle between 0° and 360°
Want the slider to be more precise? Click once on slider button (it will glow). Then use arrow keys.
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Page last modified on September 14, 2008, at 11:00 PM