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Plane Geometry
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Demonstrations 1001  1020 of 1195
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
Dissection of a Triangle to Its Mirror Image II
Dissection of a Triangle to Its Mirror Image I
Lindgren's TwoTrianglestoOne Dissection
Quadrilateral Slide
Bradley's TwoTrianglestoOne Dissection
The Area of a Triangle as Half a Rectangle
Inscribed Angles That Intercept the Same Arc
Interactive Rings Tessellation
Loyd's TwoGreekCrossestoaSquare Dissection
Pappus Chain
Poincaré Hyperbolic Disk
Spieker Center Triangle Construction
Tangent Circles
Division of the Opposite Side by an Angle Bisector
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