Coterminal and Reference Angles

Two angles in standard position are [math]coterminal[/math] if their sides coincide. [br][br]The reference angle [math]\bar{\theta}[/math] of any angle [math]\theta[/math] in standard position is the acute angle formed by the terminal side of [math]\theta[/math] and the [math]x[/math]-axis.
Coterminal and Reference Angles

Information: Coterminal and Reference Angles