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Plane Geometry
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Demonstrations 821  840 of 1202
Inversive Geometry II: The Peaucellier Inversor Mechanism
Spiral Formations from Iterated Exponentiation
The Mystery of the Disappearing Square
A Parallelogram Related to the Excircles
Bisecting a Line Segment through the Orthocenter
A Collinearity from the Medial and Excentral Triangles
Circumcircles Intersecting at the First Fermat Point
Collinearity of an Incenter and Two Circumcenters
A Hexagon with Opposite Sides Parallel
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
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
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