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Plane Geometry
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Demonstrations 801  820 of 1026
Simson's Theorem
Johnson's Theorem
FiveSquarestoOne Dissection
The Perpendicular Bisector of a Chord
Stengel's Theorem
Pedal Triangles of Isogonal Conjugates
Hinged and Translational Dissection of Two Squares to One
Circular Coverings
The Carpets Theorem
The Midpoint Quadrilateral Theorem
The Two Triangles Theorem
Euler's Theorem for Pedal Triangles
A Theorem about Two Tangent Circles
Crossed Ladders Theorem
Distances from the Centroid
Fuhrmann's Theorem
Théorème de Pascal (French)
Voronoi Diagrams
Six Incircles in an Equilateral Triangle
Hoehn's Theorem
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