Art of Problem Solving: Counting Diagonals with Division

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Art of Problem Solving's Richard Rusczyk explains how to correct for overcounting with division by counting the number of diagonals in a funky polyhedron.
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i like how at the end when he stops putting on the pieces, only then does the camera stop

Krishna-vkkx
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the polyhedron is called: Rhombicuboctahedron

jadonjung