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Plane Geometry
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Demonstrations 981  1000 of 1199
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
Angle Bisector for an Angle Subtended by a Tangent Line
Bottema's Theorem
Hjelmslev's Theorem
Bennett's OctagontoSquare Dissection
A Visual Proof of the DoubleAngle Formula for Sine
A Visual Proof of the CauchySchwarz Inequality in 2D
Menelaus' Theorem
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