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Geometry
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Demonstrations 2081  2100 of 2974
Théorème de Pappus (French)
Reflection of Parallel Rays by a Sphere
Collinearity of a Triangle's Circumcenter, Incenter, and the Contact Triangle's Orthocenter
2byn DiskPacking Paradox
The Schiffler Point
Products of Diagonal Lengths in the Regular Polygon
Laws of Reflection
A Concurrency Generated by Lines through the Orthocenter and Circles about a Triangle's Sides
Another Concurrency Generated by Circles about a Triangle's Sides and Lines through an Internal Point
A Concurrency Generated by Circles about a Triangle's Sides and Lines through an Internal Point
Signs in Space
A Circumcircle through the Midpoint of a Triangle's Side
Poisson Equation on a Circular Membrane
A Concurrency Generated by the Angle Bisectors
Tangent Lines to a Parabola
The Gergonne Point
The Intersection of Circumcircles of Medial Triangles
Waterman Polyhedra
Two Solids Made from Golden Rhombic Solids
Between Sphere and Torus
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