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Izidor Hafner
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Demonstrations 1  20 of 899
RightAngled Tetrahedron
New this month
Three Tangents to a Sphere
New this month
Spherical Cosine Rule for Angles
New this month
Construct a Dihedral Angle of a Tetrahedron Given Its Plane Angles at a Vertex
New this month
Altitude of a Tetrahedron Given Its Edges
New this month
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
Spherical Cap and Ring
Intersection of a Plane and a Tetrahedron
Completing a Tetrahedron to a Parallelepiped
Dissection of a Spherical Triangle into Three Spherical Triangles around a Spherical Hexagon
Four Theorems on Spherical Triangles
Dissection of Three Regular Spherical Pentagons into Five Equilateral Spherical Triangles
Dissection of a Spherical Equilateral Triangle into Three Isosceles Triangles
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