Mathematics - Geometry - Angles - Angle relationships (complementary, supplementary) - Angle Relationship Visualizer
Two modes: (1) COMPLEMENTARY: Show two rays forming a right angle. One adjustable angle inside - the other automatically adjusts. As one increases, the other decreases (sum=90° always). (2) SUPPLEMENTARY: Two angles on a straight line. Same dynamic behavior (sum=180°). The student sees the CONSTRAIN