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Geometry
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Demonstrations 2481  2500 of 3134
Sydler's Dissection of a Pyramid into a Prism
Dissecting the Triangular Hebesphenorotunda (Johnson Solid 92)
Two Ways of Folding a Sphinx into a Triangular Dipyramid
A Parallelogram Defined by the Centers of Four Circumcircles
Decomposing a Rhombic Solid into a Truncated Octahedron
Estimating Perimeter and Area of Simple Polygons
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
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