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Geometry
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Demonstrations 2121  2140 of 2686
Another Dissection of Two Rhombic Solids into an Icosidodecahedron and a Rhombicosidodecahedron
Dissection of the Oblate Golden Rhombohedron
Napoleon's Theorem
Area of a Parallelogram
Definitions of Hill's Tetrahedra
Fagnano's Problem
Bankoff Circle
SixPiece Dissection of Hill's Tetrahedron of Type 3 into a Triangular Prism
Cutting Polygons
Ptolemy's Theorem
FourPiece Dissection of Hill's Tetrahedron of Type 2 into a Triangular Prism
Dissection of Hill's Tetrahedron of Type 1
Curly Torus
Euclid's Proof of the Pythagorean Theorem
Miquel's Pentagram Theorem
Two Proofs of the Equality of the Volumes of a Box and a Parallelepiped
Covering the Plane with Polygons
Simson's Theorem
Johnson's Theorem
FiveSquarestoOne Dissection
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