Quadrantal Angle (Trigonometry)
Definition: Angles in the standard position where the terminal side lies on the x or y axis. For example: 90°, 180° etc.
Try this: Adjust the angle below by dragging point A and see which angles are quadrantal.

A quadrantal angle is one that is in the standard position and has a measure that is a multiple of 90° (or π/2 radians). A quadrantal angle will have its terminal lying along an x or y axis.

In the figure above, drag the point A around and see which angles are quandrantal angles.

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