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Izidor Hafner
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Demonstrations 41  60 of 946
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
Construct a Dihedral Angle of a Tetrahedron Given Its Plane Angles at a Vertex
Altitude of a Tetrahedron Given Its Edges
Tiling a Sphere with Special Right Triangles
Tiling with Spherical Triangles of Area Pi
Menelaus' and Ceva's Theorem for Spherical Triangle
Colored Spherical Projections of Polyhedra
The BudanFourier Theorem
Two Equidecomposable Triangles
Parallelepiped with Edges on Three Skew Lines
Spherical Right Triangles
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