- KİTAP1
- Dao's theorem on six circumcenters
- Triangle Angle Theorems (V3)
- Quadrilateral Interior & Exterior Angle Sum Theorems (V2)
- Exterior Angles of a Triangle
- Exterior Angles of a Quadrilateral
- Triangle Interior & Exterior Angle Sum Theorems (II)
- Triangle Angle Sum Theorem
- Quadrilateral Interior & Exterior Angle Sum Theorems (V2)
- Exterior Angles of Polygons--Proofs without Words
