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Polygons
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Demonstrations 261  280 of 346
Dissecting a Decagon into Two Pentagons and Two Pentagrams
TwoOctagonsintoOne Dissection in Two Steps
Freese's TwoOctagonsintoOne Dissection
The 26Sided Unilluminable Room
The Minkowski Sum of a Disk and a Polygon
Successive Averages of the Vertices of a Polygon
Interior and Exterior Angles of Equilateral Figures
The Minkowski Sum of Two Triangles
Area of a Parallelogram
Cutting Polygons
Ptolemy's Theorem
Miquel's Pentagram Theorem
Covering the Plane with Polygons
FiveSquarestoOne Dissection
Hinged and Translational Dissection of Two Squares to One
The Midpoint Quadrilateral Theorem
Fuhrmann's Theorem
Théorème de Pascal (French)
Voronoi Diagrams
Conjecture de Beraha pour les cycles (French)
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