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Geometry
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Demonstrations 2221  2240 of 2871
The Contact Triangle and Two Other Subtriangles
Dissecting a Rhombic Dodecahedron into an Octahedron and Two Tetrahedra
Approximating the Derivative by the Symmetric Difference Quotient
The Nagel Point
Dissecting a Rhombic Dodecahedron into Two Cubes
Decomposing a Cuboctahedron into Three Rhombic Dodecahedra and Two Tetrahedra
Nagel's Theorem
Signed Area of a Polygon
Dissection of Four Rhombic Dodecahedra into a Truncated Tetrahedron and a Tetrahedron
Second DrozFarny Circle
First DrozFarny Circle
Dissecting an Ngram into Two Smaller Ngrams
Lindgren's Dissection of an Octagram into an Octagon
Lindgren's Dissection of One Octagram {8/3} into Two
Lindgren's Dissection of One Octagram into Two
Lindgren's Dissection of One Decagram {10/3} into Two Pentagrams {5/2}
Dissecting a Dodecagram into Two Hexagrams
Dissecting a Dodecagram {12/2} into a Hexagram {6/2}
Parametric Necklace
Barrow's Inequality
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