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Izidor Hafner
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Demonstrations 481  500 of 936
Dissection of Five Equilateral Triangles into One
Dissection of a Regular Decagon into Two Pentagrams and Six Pentagons
TwistHinged Dissection of a Regular Polygon into a Polygram
Dissection of a Sphinx into a Triangle
Deduce the Net for a Die
Euler's Estimate of Pi
Cylinder Area Paradox
Kempe's Universality Theorem: An Example
Kempe's Multiplicator
Kempe's Translator
Peaucellier's and Hart's Inversor
Newton's Pi Approximation
TwoCube Calendar
Reconstruction of Vega's Prime Number Table
Dissecting a Latin Cross into a Greek Cross
Rational Functions Quiz
A WideTieCrosstoSquare Dissection
Decomposing a Regular Polygon with an Odd Number of Sides into Rhombuses and Triangles
Hanegraaf's Dissection of a Nonagon into a Triangle
TwistHinged Dissection of One Octagon into Four Octagons
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