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Izidor Hafner
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Demonstrations 121  140 of 821
Bezdek's Unistable Polyhedron With 18 Faces
Folding a Strip to Form Regular Odd nGons
Solving a Linear Diophantine Equation by Tabulation
VolumePreserving Transformations of Solid of Revolution
Copernicus's Chord Tables from De Revolutionibus Orbium Coelestium
Nonograms from Invaders
Making a Strip of Isosceles Trapezoids
Guessing the Symmetry Group
Pythagorean Theorem for Regular Polygons
Area of Parallelogram in Terms of Its Diagonals
Fourier Construction of Regular Polygons and Star Polygons
Symmetry of a Mystery Curve
Compound of Tetrahedron and Cube
Construction of Squares from a Parallelogram
Folding a Strip into a Pentagon
Four Visual Proofs of a Theorem about a Regular Nonagon
Guess the Antisymmetric Frieze Group, Part 2
Guess the Antisymmetric Frieze Group, Part 1
Horner's Method
Making a Hexagon Using a FoldandTwist Algorithm
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