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Solid Geometry
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Demonstrations 21  40 of 559
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
Theorem on the Dihedral Angles of an Isosceles Tetrahedron
Properties of Isosceles Tetrahedra
Dome of Viviani Windows
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
Parallelepiped with Edges on Three Skew Lines
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