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Plane Geometry
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Demonstrations 901  920 of 1114
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
Viviani's Theorem
Lindgren's SquaretoDodecagon Dissection
Busschop's HexagontoSquare Dissection
Brodie's PentagontoSquare Dissection
Dudeney's CrosstoIsoscelesRightTriangle Dissection
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