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Geometry
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Demonstrations 101  120 of 3020
Dissection of a Regular Enneagon into Four Congruent Regular Enneagons
Overlapping Volcano Unfolding of a Prismoid
Dissecting a Regular Hexagon into Five Congruent Regular Hexagons
Varsady's Dissection of a Regular Pentagon into Six Congruent Regular Pentagons
Dissection of an Equilateral Triangle into Five Equilateral Triangles
Cube and Octahedron Sculpture
Inside a Helix of Tetrahedra
Rolling a Regular Dodecahedron on a Congruent Dodecahedron
Decomposing a Random Newton Polygon
Frederickson's Dissection of a Regular Dodecagon into Two Congruent Regular Dodecagons
Helix of Tetrahedra
Theobald's Dissection of One Regular Octagon into Two
Voronoi Diagrams in TwoDimensional Regions
Voronoi Diagrams for European Cities
Kakeya Needle Problem
Frederickson's Second Dissection of an Octagon to Five Octagons
Building on an Icosahedron
Proposals for Medals for the Tokyo 2020 Olympic Games
Cubes on a Hyperbolic Paraboloid
Frederickson's Hinged Dissection of Five Decagons to One
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