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Geometry
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Demonstrations 41  60 of 3134
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
Roulette (Hypotrochogon) of a Circle Rolling inside a Regular Polygon
Open Flexible Frame Based on a Rhombic Dodecahedron
A OneParameter Family of Zonohedra
Series Approximation for the Schwarz D Surface
Dissection and Reassembly of Parallelogram of Given Base and Altitude
Isoperiodic Potentials via Series Expansion
Theorem on the Dihedral Angles of an Isosceles Tetrahedron
Properties of Isosceles Tetrahedra
Roulette (Hypotrochogon) of a Polygon Rolling inside Another Polygon
Roulette (Epitrochogon) of a Regular Polygon Rolling around Another Regular Polygon
Dome of Viviani Windows
The Nagel Line
RightAngled Tetrahedron
Three Tangents to a Sphere
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