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Geometry
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Demonstrations 21  40 of 2628
On Which Side of a Directed Line Is a Point?
New this month
Sydler's Dissection of a Hill Tetrahedron into an Isosceles Triangular Prism
Minimal Coloring of Platonic Solids
Brianchon's Theorem
Rhombic 210hedron
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
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