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Demonstrations 321  340 of 459
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
Two Hinged Dissections
Théorème de Pappus (French)
Products of Diagonal Lengths in the Regular Polygon
A Cyclic Quadrilateral Concurrency
A Parallelogram with Vertices on Two Circles
Area of a Hexagon Formed by the Vertices and Altitude Extensions of a Triangle
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