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gnomon to square
Hinge Dissection: Gnomon to a Square
Steffen's Flexible Polyhedron
Steffen's Flexible Polyhedron
triangular dipyramid
Triangular Dipyramid
pentagonal dipyramid
Pentagonal Dipyramid
triaugmented triangular prism
Triaugmented Triangular Prism
cards with holes and slots
Self-sorting Cards
gyroelongated square dipyramid
Gyroelongated Square Dipyramid
snub disphenoid
Snub Disphenoid
angles in a triangle sum to 180 degrees
Illustrate That Interior Angles of a Triangle Sum to 180°
Goldberg's tristable polyhedron
Goldberg's Tri-stable Polyhedron
trisected angle
Trisect an Angle by Folding
Bricard's flexible octahedron
Bricard's Flexible Octahedron
fold the cube root of two
Double a Cube
rhombic dodecahedron
Rhombic Dodecahedron
maximum volume from square net
Maximum Volume from a Square Net
Császár polyhedron
Császár Polyhedron
Szilassi Polyhedron
Szilassi Polyhedron
Sarrus linkage
Sarrus Straight Line Polyhedral Linkage
Beehive Cells
Beehive Cells
block of eight stamps in two rows
Stamp-Folding Puzzles
pentominoes
Fold Pentominoes from a Loop of Triangles
Hyperboloid Haircut
Hyperboloid Haircut
Net of an Oblique Circular Cylinder
Net of an Oblique Circular Cylinder
Helicoid String Art
Helicoid String Art
Cut Penrose Tiles Quickly
Cut Penrose Tiles Quickly
pyramid and three pyramids forming a cube
The Volume of a Pyramid is One-Third that of a Prism
Space-Filling Bisymmetric Hendecahedron
Space-Filling Bisymmetric Hendecahedron
chestahedron
Chestahedron
Golden Rhombohedron
Golden Rhombohedra
Cross Space Fillers
Cross Space Fillers