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Demonstrations 21 - 40 of 552
Theorem on the Dihedral Angles of an Isosceles Tetrahedron
Properties of Isosceles Tetrahedra
Dome of Viviani Windows
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
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 a Spherical Equilateral Triangle into Three Isosceles Triangles
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