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Demonstrations 21  40 of 2050
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
Model of an Industrial Robot Arm
Open Flexible Frame Based on a Rhombic Dodecahedron
A OneParameter Family of Zonohedra
Series Approximation for the Schwarz D Surface
Theorem on the Dihedral Angles of an Isosceles Tetrahedron
Properties of Isosceles Tetrahedra
Chemical Reactions Represented via a 3D Simplex
Dome of Viviani Windows
RightAngled Tetrahedron
Three Tangents to a Sphere
Spherical Cosine Rule for Angles
Robot Builder
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
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