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Geometry
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Demonstrations 2301  2320 of 3204
Turning a Punctured Torus Inside Out
A Concurrency from a Point and a Triangle's Excenters
Crazy Surfaces
The 57Cell
Concyclic Points from Reflections of the Circumcenter about the Altitudes
Two Hinged Dissections
Möbius Strip as a HalfTwisted Square Torus
Line through Two Points
Cubic Close Packing
Change of Basis in 2D
Implicit Function Game
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
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