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Izidor Hafner
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Demonstrations 361  380 of 1010
A OneParameter Family of Polyhedra with Two Kinds of Symmetries
Mazes on a Cylinder, Including Its Ends
Relations between Golden Rhombic Solids and Some Archimedean Solids
Ball of 30 Octahedra
Mazes on Various Map Projections of the Earth
Dissection of Two Stellated Dodecahedra
26Piece Dissection of a Cube
Dissection of a Concave Rhombic Triacontahedron
Dissection of a Cube to a Quarter of a Rhombic Dodecahedron of the Second Kind
Commutativity of 3D Vector Addition
Rhombic 210hedron
Orthogonal Projection of a Solid of Constant Width
The Ellipse Problem of Steinhaus
Vernier Scale with Extra Precision
Balancing Abstract Chemical Equations with One Kind of Atom
Two Proofs that the Volume of the Regular Octahedron Is Four Times the Volume of the Regular Tetrahedron
Symmetries of a Prism
Proposition 30, Book XI, Euclid's Elements
Proposition 29, Book XI, Euclid's Elements
Inverting the Rhombic Dodecahedron
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