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Izidor Hafner
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Demonstrations 361  380 of 1025
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
Making a Hexagon Using a FoldandTwist Algorithm
The Diagonal Paradox
Measuring with Two Jugs
Ptolemy's Table of Chords
Copernicus's Chord Tables
Loyd's Dissection of a Square to Five Different Figures
Folding a Rectangle into an Envelope
Converting among Dyadic, Decimal, and Binary Notation
Volume of a Polyhedron Given by a Particular Net
Projections of Cubes and HalfCubes
The Obedient Reflected Ray
Dissection of a Square and an Isosceles Right Triangle into a Square
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