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Geometry
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Demonstrations 2461  2480 of 3019
The Area of the Contact Triangle
Perpendiculars to a Chord
Dissection of a Cube into Two Kinds of Triacontahedra
The Minkowski Sum of Two Triangles
Theorem of the Owl's Eyes
Dissection of Three Bilunabirotundas and a Dodecahedron into Rhombic Solids
Proof of Proposition 28, Book XI, Euclid's Elements
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
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