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Geometry
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Demonstrations 2501  2520 of 2973
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
How the Altitude Divides the Hypotenuse
Unfolding Polyhedron Nets
Frenet Frame
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
Duals by Rotating the Edges of Polyhedra
Interactive Rings Tessellation
Loyd's TwoGreekCrossestoaSquare Dissection
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