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Geometry
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Demonstrations 2061  2080 of 2929
A Cyclic Quadrilateral Concurrency
The Line through the Incenter and Circumcenter
A Collinearity between the NinePoint Center, the Foot of an Altitude, and a Midpoint
A Triangle Formed by the Centers of Three NinePoint Circles
A Parallelogram with Vertices on Two Circles
Area of a Hexagon Formed by the Vertices and Altitude Extensions of a Triangle
Real Elliptic Curves
Ammann Chair
Recursively Defined Partial Tilings of the Plane
Ammann Tiles
Dissection of a Cube into Five Polyhedra
Changing a Coefficient in Polynomials of Low Degree
Voronoi Kaleidoscope
The Complex Unit Circle
Hyperbolization of a Dodecahedron
Dual Billiards
Kosnita's Theorem
Reflection from a Freehand Polynomial Mirror
A Concurrency of Lines Joining Orthocenters
Two Triangles of Equal Area on Either Side of an Angle Bisector
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