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Izidor Hafner
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Demonstrations 541  560 of 936
The Ellipsograph, a Mechanism for Constructing an Ellipse
Curves and Surfaces of Constant Width
Mazes on Polyhedra Seen from Two Viewpoints
Sum of Volumes of Several Platonic and Archimedean Solids
A Subset of Phi Space
Minimum Number of Managers
Nonlogarithmic Slide Rule
Nomogram for the Geometric Mean
Dissecting a Square to Four Squares
Elementary Transformations of a Sine Wave Quiz
Function Transformations Quiz
Linear Function Quiz
Coloring the Plane with a Rolling Cube
Coloring the Plane with a Rolling Tetrahedron
Estimate Derivative
Spies and Double Agents
When Is a Piecewise Function Differentiable?
Folding a Trapezoid into Two Different Rectangles
Trisecting an Angle Using a Lemniscate
Arc Length of a Logarithmic Spiral
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