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Recreational Mathematics
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Demonstrations 661  680 of 955
A Polygon That Folds into a Regular Tetrahedron or into a Rectangular Box
14Piece Dissection of Juel's Pyramid into a Parallelepiped
Dissecting a Square Pyramid into 15 Pieces
A Net That Folds into an Icosahedron or into a Double Biaugmented Triangular Prism
Two Ways to Fold a Net into a Biaugmented Triangular Prism
Dissection of a Cube into a Cuboctahedron and an Octahedron
Three Ways to Fold a Net into a Snub Disphenoid
A Triangle Inequality Involving the Altitudes, Semiperimeter, Inradius, and Circumradius
Dissecting a Hexagon into Four Smaller Hexagons
The Game of Nim
Mona Lisa and the Golden Rectangle
Problems on Circles VI: Poncelet Transversals
Sections of the 16Cell
Overhanging Cards
Hinged Dissections: From Equilateral Triangle to Square
Equilateral Triangle to Square
Spirals!
Moving the Vertices of the Great Rhombicuboctahedron
NoFourInPlane Problem
Intrinsically Knotted Graphs
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