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Izidor Hafner
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Demonstrations 101  120 of 1010
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
Theorem on the Dihedral Angles of an Isosceles Tetrahedron
Properties of Isosceles Tetrahedra
RightAngled Tetrahedron
Three Tangents to a Sphere
Spherical Cosine Rule for Angles
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