Plane Geometry
Demonstrations 861 - 880 of 1229
 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 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) Hinged Dissections: From Equilateral Triangle to Square Problems on Circles III: Apollonius's Problem Problems on Circles I: Dissecting a Circle Recursive Exercises IV: Rep-Tiles 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

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