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Demonstrations 21  40 of 535
Freese's Dissection of a Regular Dodecagon into 12
Polygons on n Vertices
Pappus's Hexagons
Freese's Dissection of a Regular Hexagon into Seven Hexagons
Inscribed Triangles in Polygons
Right Pyramid Volume and Surface Area
Freese's Dissection of a Regular Dodecagon into Six Squares
2. Ambiguous Rings Based on a Polygon
Total Areas of Alternating Subtriangles in a Regular Polygon with 2n Sides
Sum of the Squares of the Sides of a Projected Regular Tetrahedron
Polyhedron Faces Identification
The Sum of Opposite Angles of a Quadrilateral in a Circle is 180 Degrees
Four Kinds of Rhombic Polyhedra
Folding Hexagons
Interior and Exterior Angles of Regular Polygons
Freese's Dissection of a Regular Pentadecagon into Two
Freese's Dissection of a Regular Dodecagon into a Regular Hexagon and the Reverse
Variant of Freese's Nonagonal Double Ring Expansion
Freese's Dissection of a Regular Decagon into Five
Freese's Dissection of a Regular Dodecagon into Three Congruent Squares
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