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Plane Geometry
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Demonstrations 861  880 of 1056
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
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
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