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Izidor Hafner
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Demonstrations 521  540 of 899
Folding a Trapezoid into Two Different Rectangles
Trisecting an Angle Using a Lemniscate
Arc Length of a Logarithmic Spiral
Lemaire's Second Dissection of the Maltese Cross to a Square
Dudeney's Proof of the Pythagorean Theorem
Folding a Trapezoid into a Rectangle
Lemaire's Dissection of the Maltese Cross to a Square
Mechanism for Drawing a Logarithmic Spiral
Another OctagramToSquare Dissection
Folding a Mitre into a Gnomon
Loyd's Dissection of a Clipped Rectangle to a Square
Drawing a Logarithmic Spiral
Trisecting an Angle Using Tschirnhaus's Cubic
Inconsistent Sets of Statements from Knights and Knaves
Number of Horizontal Rhombuses
Truth Tellers on Tuesdays
Seating Friends around a Table
Logic Metapuzzle Generator
A Puzzle about Labeled Logicians
Alternative on the Island of Knights and Knaves
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