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Geometry
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Demonstrations 2381  2400 of 3134
The Square of a Median in Terms of the Triangle's Sides
Problems on Circles II: Halving a Set of Points
Volume of Cones, Pyramids, and Spheres
Bisection of Segments by the Sides of a Triangle
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)
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!
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