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Izidor Hafner
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Demonstrations 381  400 of 615
Mazes on Various Surfaces
Tilson's SquaretoPentagram Dissection
Bradley's HexagramtoSquare Dissection
Dissecting a Cube into a Tetrahedron and a Square Pyramid
Geometric Solution of a Quadratic Equation
A Special Case of the Sum of Two Cosines
Archimedes's Neusis AngleTrisection
Method of Integer Measures
Guessing a Number Using the Chinese Remainder Theorem
Approximation of Irrationals
Projection of Earth on Polyhedra
Rational Linear Combinations of Pure Geodetic Angles, Part 2
Rational Linear Combinations of Pure Geodetic Angles
Two Visual Proofs of a Basic Trigonometric Identity
Ternary Card Game
Squares of Sine and Cosine
Proof of the Difference Formula for Sine and of the Addition Formula for Cosine
Simultaneous Approximation of Two Real Numbers by Rationals
Dissection Proof of the Addition Formula for Sines
Dissection of a Pentagon to Almost a Square
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