Right Angle Triangle Construction and Angle Relationships

① This GeoGebra example dynamically constructs a right-angled triangle, visually demonstrating the right angle and the relationships between the acute angles and sides. ② Core mathematical concepts include properties of right triangles, angle sum (180°), side-angle correspondence, and geometric transformations such as rotation. ③ Construction details: uses Segment to create sides, Rotate to generate the right angle, and Angle to mark angles; objects include points A, B, C, segments a, b, c, rotated point B', angles α and β, and text labels. ④ Suitable for middle school geometry teaching to understand right triangle definitions, angle measurement, and dynamic construction methods, also serving as an introductory GeoGebra example.