Lam-Ca Construction - Sliding Rectangles

Topic:Angles, Area, Circle, Constructions, Cosine, Diagrams, Division, Equations, Geometry, Line Segment, Straight Lines, Plane Figures or Shapes, Pythagoras or Pythagorean Theorem, Rectangle, Right Triangles, Similarity Transformation or Similarity, Sine, Special Points, Square, Surface, Geometric Transformations, Triangles, Trigonometric Functions, Trigonometry, Unit Circle