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Geometry
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Demonstrations 2381  2400 of 3165
The Spatial Midpoint Quadrilateral Theorem
The x^x Spindle
Product of Two LeviCivita Tensors
A Generalization of IMO 2008 Problem 1
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
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