Series Content INTRO 歐幾里得與幾何原本 | Euclid and Elements LESSON 1 演繹法簡介 | Introduction to Deduction LESSON 2 直線及點的角 | Angles on a Straight Line and Angles at a Point LESSON 3 平行線的角 | Angles of Parallel Lines LESSON 4 平行線的條件 | Conditions for Parallel Lines LESSON 5 三角形的邊角特性 | Properties of Angles and Sides of Triangles LESSON 6 多邊形的角特性 | Angles Properties of Polygons LESSON 7 演繹證明例題 (全等及相似三角形) | Deductive Proof (Congruent and Similar Triangles) LESSON 8 尺規作圖 | Compass-and-straightedge Construction ADD-ON 平行公設 | Parallel Postulate
