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Plane Geometry
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Demonstrations 1021  1040 of 1229
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
The ThreeChord Lemma
A Product of Chord Lengths in a Circle
The Chordal Theorem
Secant Intersection with Two Internally Tangent Circles
Dividing a Right Triangle by the Altitude to the Hypotenuse
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