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Izidor Hafner
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Demonstrations 81  100 of 1000
Three EdgetoEdge Sphere Tilings with Right Triangles
Triangles with Equal Area Are Equidecomposable (Equivalent by Dissection)
Three Spherical Triangles of Equal Area
Dissection of a Composite Spherical Triangle
Perspective Projection of a Cube onto a Plane
Dissection of a Spherical Square into a Spherical Lune
Dissection of a Spherical Triangle into a Square
Hinged Dissection of a Spherical Triangle into a Spherical Lune
Dissection of a Spherical Triangle into a Spherical Lune
Dissection of Gerwien's Triangle into a Saccheri Quadrilateral on the Sphere
Orthogonal Projections of the Edges of a Cube
Monge Point of a Tetrahedron
Locus of Points at Constant Distance from the Edges of a Trihedron
Three Planes in a Trihedron
Locus of Centers of Spheres
Inscribed and Circumscribed Spheres of a Tetrahedron
Two Conditions for a Tetrahedron to Be Orthocentric
Open Flexible Frame Based on a Rhombic Dodecahedron
A OneParameter Family of Zonohedra
Dissection and Reassembly of Parallelogram of Given Base and Altitude
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