Dynamic Demonstration of Angle Between Two Vectors

This GeoGebra example dynamically illustrates the angle between two vectors, using polygons, mirror transformations, and auxiliary constructions to visualize vector directions and the magnitude of the included angle. Core mathematical concepts include vector definition, angle calculation, geometric transformations (mirroring), and polygon properties. The construction employs commands such as Segment to create vector lines, Point to define key vertices, and Mirror to generate symmetric figures, involving multiple objects (A, B, C, D, E, F, G, H, pic1, pic2, etc.) to build a rich visual context. Suitable for high school or early college students learning vector geometry and spatial orientation, and for teachers demonstrating the relationship between vector angles and geometric transformations in class.