Angle Orientations (Standard Position) - Dynamic & Modifiable Illustrator

① This example dynamically illustrates how positive and negative angles are drawn in standard position (vertex at origin, initial side along positive x-axis), with an interactive and modifiable interface. ② Core math concepts include standard position of angles, orientation (counterclockwise for positive, clockwise for negative), and dynamic angle measurement. ③ Construction uses GeoGebra commands such as CurveCartesian, Segment, Circle, Intersect, CircleArc, Angle, Ray, Vector, and Mirror; objects include points (A, B, C, D, E, etc.), segments, circles, angle α, and a button (button1) for interactive modification. ④ Suitable for middle and high school students learning angle concepts, introductory trigonometry, or geometry; also useful for teachers demonstrating angle orientation in class or for students exploring angle direction and magnitude independently.