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Geometry
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Demonstrations 2121  2140 of 2871
Lester's Theorem
The Circumcircle of the Orthocenter and Two Vertices and a Parallelogram
Orthocentre d'un triangle inscrit dans une hyperbole (French)
Projections of the 16Cell
Hinged Dissections: From Equilateral Triangle to Square
Problems on Circles III: Apollonius's Problem
Problems on Circles I: Dissecting a Circle
Recursive Exercises IV: RepTiles
Equilateral Triangle to Square
The Area of the Excentral Triangle
Problems on Circles IV: Circles Tangent to Two Others with a Given Radius
Normal Sections and Gauss Map for the Hyperbolic Paraboloid
Spirals!
Estimating the Surface Area and Volume of a Rectangular Prism
Virtual Flowers with Crispate Petals
The Product of the Distances of the Incenter to the Vertices
Ellipse and Friends
Recursive Exercises II: A paradox
Variations on a Tetrix
Estimating the Side Length of a Square from Its Area
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