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Polygons
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Demonstrations 281  300 of 425
Napoleon's and van Aubel's Theorems
Inversion of an Array of Cubes
Taylor's Hinged Dissection of One Parallelogram into Another
Macaulay's Triangle and Trapezoid Hinged Dissection
Two Hinged Dissections of a Gnomon to a Square
Two Hinged Dissections of a Greek Cross to a Square
Equivalence of Three Catalan Number Interpretations
Hinged Dissection of Squares
Hinged Dissection of Four Hexagons into One
Labeled Polygon Triangulations
Another Triangle into Hexagram Dissection
Hinged Dissection of an Equilateral Triangle into Two Hexagons
Hinged Dissection of an Equilateral Triangle into a Hexagram
Cross Sections of Regular Polyhedra
Total Areas of Alternating Subtriangles in a 2ngon
Equilateral Triangles That Form a Star
Reciprocals of Diagonal Lengths in the Regular Polygon of Unit Side
Beraha's Conjecture, Wheels, and Cyclic Graphs
An Efficient Test for a Point to Be in a Convex Polygon
Areas of Parallelograms and Trapezoids
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