Unit Circle and Tangent Function Demo

① This example dynamically shows the correspondence between an angle on the unit circle and its tangent value; the y‑coordinate of the green segment equals the tangent of the angle. ② Core mathematical concepts: unit circle, trigonometric functions (sine, cosine, tangent), angle measurement in radians and degrees, and the graph of the tangent function in coordinate geometry. ③ Construction highlights: Point and Circle create the unit circle and a movable point; Intersect, Rotate, and Angle define the angle; Segment, OrthogonalLine, Tangent, Line, and Ray build the tangent line and its projection to display the tangent value in real time. ④ Suitable for high‑school trigonometry lessons, college pre‑calculus introductions, and interactive GeoGebra teaching materials.