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Plane Geometry
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Demonstrations 781  800 of 1139
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
Feuerbach's Theorem
The Center and Radius of the NinePoint Circle
Classifying Quadrilaterals
The Distance to the Orthocenter
Rectangles: Perimeter and Area
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