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Izidor Hafner
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Demonstrations 61  80 of 1272
FourSet Venn Diagram Game
Paper Folding Using Two Points
Determining the Intersection of Two Lines Graphically
Square with Lines and Points
Gauss on Vega's Thesaurus Logarithmorum Completus
Vega's Tables of Common Logarithms to Seven Decimals
Vega's 1794 Table of Common Logarithms
Reconstruction of de DeckerVlacq's 1628 Table of Common Logarithms
Golden Rhomboidal Dodecahedron
Filling Space with a Bilinski Dodecahedron and an Acute Golden Rhombohedron
Venn Diagrams with Four Ellipses
Symmetric Decompositions of a Rhombic Triacontahedron
Kowalewski's Games with Kepler's Solid
Constructions by Reflecting in a Line
Dissecting a Cube into an H Shape and Two Cubes
Towers Puzzle
Polar Maze
Dissecting an Acute Golden Rhombohedron into a Rectangular Solid
Two Dissections of a Golden Rhombohedron into OneHalf of a Bilinski Dodecahedron
Dissecting Five Cubes into a Rectangular Solid with a Square Base
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