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Geometry
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Demonstrations 2121  2140 of 2904
Dust with Line Shadows in Every Direction
A Concurrency Involving the Midpoints of the Sides and the Altitudes
Angle Bisector Theorem
The Ratio of a Side of a Triangle to the Corresponding Side of the Orthic Triangle
Concyclic Points Derived from Midpoints of Altitudes
Problems on Circles VI: Poncelet Transversals
Inversive Geometry III: Inverting an Ellipse
Inversive Geometry II: The Peaucellier Inversor Mechanism
Hexagonal Prism Totalistic Cellular Automaton
Fractal Octahedra I
Spiral Formations from Iterated Exponentiation
The Mystery of the Disappearing Square
Sections of the 16Cell
A Parallelogram Related to the Excircles
Bisecting a Line Segment through the Orthocenter
Truncated Octahedra Outer Totalistic Cellular Automaton
A Collinearity from the Medial and Excentral Triangles
Rhombic Dodecahedra Totalistic Cellular Automaton
Circumcircles Intersecting at the First Fermat Point
Collinearity of an Incenter and Two Circumcenters
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