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Izidor Hafner
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Demonstrations 21  40 of 818
Duffin's Sequence for Pi
Rolling a Regular Polygon on the Unit Circle
The Spherical Patterns for Point Groups
Rolling a Cube on a Small Rhombicuboctahedron
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
Rolling a Regular Dodecahedron on a Congruent Dodecahedron
Frederickson's Dissection of a Regular Dodecagon into Two Congruent Regular Dodecagons
Theobald's Dissection of One Regular Octagon into Two
Basis for a Topology
Kakeya Needle Problem
Frederickson's Second Dissection of an Octagon to Five Octagons
Proposals for Medals for the Tokyo 2020 Olympic Games
Frederickson's Hinged Dissection of Five Decagons to One
Lindgren's Symmetrical Decompositions of Regular 2nGons
All 11 Folding Nets of the Regular Octahedron
All 11 Folding Nets of the Cube
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