Angle Types Demonstration

① This example shows how to dynamically display the five basic angle types — acute, right, obtuse, straight, and reflex — in GeoGebra. ② Core mathematical concepts include the definition and classification of angles, angle measurement in degrees and radians, and rotational transformations. ③ Construction highlights: the Rotate command creates rotated copies of a ray, the Angle command automatically measures and labels angles, and the Segment command builds the angle sides; key objects are vertices A, B, C, angle symbols α, β, γ, segments a, b, and text labels text1–text9 for annotation. ④ Suitable for middle‑school geometry (grades 7‑9) and high‑school review, serving both teacher demonstrations and student‑driven exploration.