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George Beck
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Demonstrations 21  40 of 145
Matrix Addition and Subtraction
Plot a Quadratic Inequality
Insphere and Four Exspheres of a Tetrahedron
Permutations, kPermutations and Combinations
Cone, Tent, and Cylinder
Chains of Regular Polygons and Polyhedra
Rotational Symmetries of Platonic Solids
Duals by Rotating the Edges of Polyhedra
Combining Two 3D Rotations
Passing a Cube through a Cube of the Same Size
0/1Polytopes in 3D
The Path of a Ray on a Cube
Applications of Lanchester's Square Law
Eulerian Numbers versus Stirling Numbers of the First Kind
Multiple Reflections of a Regular Polygon in Its Sides
The FourRunner Problem
Iteratively Reflecting a Point in the Sides of a Triangle
Wythoff's Icosahedral Kaleidoscope
Blood Spatter Trigonometry
Cross Ratios in the Complex Plane
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