- Geometry
- Trapezoid: Area (I)
- Area of Trapezoid
- Area of Circles
- Cut Triangles into Rectangles & Dudeney's Puzzle Generalized
- Area of a Circle - Wedge/Sector Demonstration
- Water Triangle
- Exterior Angles of Polygons
- Pythagorean Polygons
- Rotating a Triangle Around a Coordinate Axis
- Patterns of a cube
- Net of a Cone
- Surface Area of Spheres
- Curved Surface Area of Cones (Parametric Curved Surface)
- Escherized Tessellation
- Cavalieri's Principle
- Cavalieri's Principle
- Archimedes and the Volume of a Sphere
- cube cross section
- Angle sum theorem
- Investigation of the sum of angles in a triangle
- Exterior angle of a triangle
- Trigonometry- Finding A side Lenght in A Right Triangle
- What's My Rule #2?
- Proof Without Words
- SAS: Dynamic Proof!
- SSS: Dynamic Proof!
- Is "SSA" Legit? What Do You Think?
- Animation 97
- Similar Right Triangles (II)
- Trigonometric Ratios (Right Triangle Context)
- Right Triangle Ratios
- Falling tree
- Relative Velocity: Boat Crossing a River
- Congruent Chords (I)
- Inscribed Angle Theorem: Corollary 1
- Angle Formed by 2 Chords (II)
- Angle Formed by Chord & Tangent (II)
- Ferris Wheel Unit Circle
- Double Reflection
- Reflection Activity
- Transformations
- Rigid Motions of the Plane
- Translations and Reflections, Hearne, Erik
- Kaleidoscope
- Reflections, Rotations, Dilations, and Translations
- Experimenting with reflection
- Analog Clock
- Law of Sines
- Volume of rectangular prisms
- Adjustable Prisms
- Area of Circles
- 12.1a Lateral Area of a Cone
- Right Circular Cylinder!
- Surface Area & Volume of Rectangular Prisms
- Rectangular Pyramid
- AA Similarity Theorem
