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Izidor. Hafner
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Demonstrations 61  80 of 579
Sum of Numbers on Invisible Faces
Halving the Perimeter of a Zigzag Polygon
120 Rhombic Dodecahedra of the Second Kind Arranged in a Ball
Constructing the Cube Root of Two
Steinhaus' Billiard Ball Loop
Conway's Billiard Ball Loop
Halving the Perimeter of a HeartShaped Curve
Trisecting an Angle Using the Cycloid of Ceva
Lindgren's Dissection of a Parallelogram to a Parallelogram
Four Polyhedra, Each with an Unfolding that Overlaps Itself
Deduce the Net for a Die's Net
Two Dissections of the Letter E to a Square
Decomposition into Isosceles Triangles with Angles That Are Multiples of Pi/4
The Sum of the First n Odd Numbers
A TwistHinged Dissection of Triangles
Lindgren's Dissection of a Quadrilateral to a Triangle
Calendar on Dodecahedron
Make Mazes on a Moebius Strip
Dissection of One Quadrilateral to Another
Dudeney's Step Dissection of a Rectangle to a Square
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