Reference Angle on the Unit Circle

This GeoGebra example dynamically illustrates the definition and calculation of reference angles on the unit circle. Core concepts include trigonometric functions, angle reduction, and unit circle properties. Construction uses Circle for the unit circle, Sequence for angle values, Point and Angle to mark references, plus Segment and CurveCartesian for auxiliary elements. Ideal for high-school trigonometry lessons and self-study to visualize acute, obtuse, and reference angle relationships.