Unit Circle with Tangent Line

This example demonstrates the tangent line to a point on the unit circle and its related geometric properties. Core math concepts include the unit circle, tangent line, angle, orthogonal line, and analytical geometry. Construction highlights involve GeoGebra commands/objects like Point, Ray, Angle, OrthogonalLine, Intersect, Segment, CircleArc, Line, If, AnimationState, and ControlText. Suitable for high school students learning trigonometry, derivatives, and geometric constructions.