Rotation Triangle Grid 2

① This example demonstrates a grid pattern formed by repeatedly rotating a triangle. ② Core mathematical concepts include triangle congruence, rotation transformations, geometric grid construction, and vector operations in coordinate geometry. ③ Construction highlights: Polygon creates the initial triangle, Line draws its edges, Rotate applies successive rotations, and step1, step2, step3 together with button1 and text1 drive the interactive animation. ④ Suitable for high‑school geometry, university analytic geometry courses, and advanced GeoGebra construction practice.