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Izidor Hafner
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Demonstrations 521  540 of 1010
Arrangements of Golden Prolate Rhombohedra
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
Halving the Perimeter of a HeartShaped Curve
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
Make Mazes on a Moebius Strip
Dissection of One Quadrilateral to Another
Dudeney's Step Dissection of a Rectangle to a Square
Deduce the Net for an Octahedral Die
Calculating Logarithms with a Series
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