- 원
- Circle Area (By Peeling!)
- Inscribed Angle Theorem: Take 2!
- Inscribed Angle Theorem: Corollary 1
- Theorems about Measuring Inscribed Angles 1
- Theorems about Measuring Inscribed Angles 2
- Theorems about Inscribed Polygons 3 and 4
- Inscribed Angle Theorem (V1)
- Arcs, Angles and Chords Theorem 1
- Arcs, Angles and Chords Theorem 2
- Arcs, Angles and Chords Theorem 3
- Arcs, Angles and Chords Theorem 4
- Chord Properties 1
- Chord Properties 2
- Chord Properties 3
- Cyclic Quadrilaterals 1
- Cyclic Quadrilaterals 2
- Tangent Properties 1
- Tangent Properties 2
- Tangent Properties 3
- Tangent Properties 4
- Tangent Properties 5
- Spirograph-Epitrochoid Earth and Moon
- archimedes' "salinon"
- ptolemy's theorems
- the seed of life
- Thales' theorem
- trammel of archimedes
- yin-yang
- Geometry - 8.9 AP2
- Moss Egg by Robert Dixon
- Geometry - 8.4 AP1
- Geometry - 8.8 AP1
- Item 7 - Temple Geometry
- The foci of an ellipse, reflected across its tangents (2)
- Inscribed Angle Intercepts Semicircle
- Geometry - 8.14 AP2
- 9.1 arcs-chords-angles
- 9.2 inscribed angles
- 9.3 angle on diameter
- 9.3 cyclic quads
- 9.4 chord angles
- 9.4 power theorem
- 9.5 tangent radius
- 9.5 chord and perp bis
- 9.6 tangent chord
- 9.6 two secants
- 9.9 circle graphs
- The Arbelos 1
- The Arbelos 2
- The Arbelos 3
- The Arbelos 4: The Inscribed Circle
- The Arbelos 5: The Bankoff Circle
