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Plane Geometry
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Demonstrations 821  840 of 1184
The Sum of the Squares of the Distances from the Vertices to the Orthocenter
The Orthocenter of the Medial Triangle
Four Collinear Points Related to the Altitudes
Lester's Theorem
The Circumcircle of the Orthocenter and Two Vertices and a Parallelogram
Orthocentre d'un triangle inscrit dans une hyperbole (French)
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
The Product of the Distances of the Incenter to the Vertices
Recursive Exercises II: A paradox
Estimating the Side Length of a Square from Its Area
Recursive Exercises I
Tiles around a Swimming Pool
Normal Lines to a Parabola
The Second Lemoine Circle
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