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Geometry
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Demonstrations 161  180 of 2713
Brianchon's Theorem
Angle of Intersection of Two Circles
Random Walks in Platonic and Archimedean Polyhedra
Multiple Reflections in Two Mirrors
The Insphere and Circumsphere of a Tetrahedron
Rotating Pythagoras
The Pedal and Antipedal Triangles
Twenty Tetrahedra in Icosahedral Cluster
Three Pyramids That Form a Cube
Proposition 7, Book XII, Euclid's Elements
Space Filling with a Rhombic Dodecahedron of the Second Kind
Exact Trilinear Coordinates
Orthologic Triangles
Escher Solid as a Puzzle
Dividing a Regular Tetrahedron into Four Congruent Pieces
Ellipse Rolling inside a Circle
Ellipse Rolling around Another Ellipse
Goldberg's Tristable Polyhedron
Distorting Jessen's Orthogonal Icosahedron to an Octahedron
SpaceFilling Polyhedra Based on a Truncated Octahedron
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