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Geometry
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Demonstrations 2101  2120 of 2864
The Product of the Perpendiculars to the Sides of a Triangle
Tangents to the Circumcircle at the Vertices
Displacement versus Distance
The Orthocentroidal Circle
Pairwise Tangent Circles Centered at the Vertices of a Triangle
The Area of the Pedal Triangle of the Centroid
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
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