Angle, two rays with a common endpoint, Initial Side, The non-rotating ray that sits in standard position, Terminal Side, The ray that is allowed to rotate, Rotation angles, Angles with a terminal and initial side in the unit circle, Standard Position, vertex is at origin and the initial side lies on the ositive side of the x-axis, Positive rotation, When the angle results from a counterclockwise rotation, Negative rotation, when the angle results from a clockwise rotation, Quadrantal angle, An angle whose terminal side lies on either the x-axis or the y-axi, Co-terminal, angles in standard position that share the same terminal side

Unit Circle Vocabulary

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