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Geometry
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Demonstrations 121  140 of 2686
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
The Geometry of the Steiner Tree Problem for up to Five Points
A Relationship between the Cube, Tetrahedron, Octahedron, and Rhombic Dodecahedron
Infinitesimally Flexible Octahedron
Tiling the Octahedron and the Plane with Tiling of a Hexagram
Constructing a Steiner Tree for Five Points
The Four KeplerPoinsot Solids
Ellipse Rolling around a Circle
Kepler's Rhombic Solids
Scherk Minimal Surfaces
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