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George Beck
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Demonstrations 21  40 of 149
Some Special Types of Matrices
Rule of Sum and the InclusionExclusion Principle
Directed Angles and Their Types
The Four Quadrants
Duals of Platonic Solids
Vertex and Edge Truncations of the Platonic Solids
Multiplying a Matrix by a Number
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
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