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"We can take a one-quarter tetrahedron and make a perpendicular bisector from any given vertex to the opposite edge. The three perpendicular bisectors cut the one-quarter tetrahedron into six pieces of pie. . . The quarter tetrahedron divides into six symmetrical components, each of which is one-sixth of a quarter tetrahedron, or one 24th of a tetrahedron. I call these units “A” Particles which are increments of “A” tetrahedra.
“This is a very interesting piece of geometry because we find that if made of paper it can be unfolded to become a triangle and at one corner the angles appear on the paper as 30 degrees, 35 degrees and 16 minutes, and 19 degrees and 28 minutes. This is an asymmetrical triangle of three different size edges and not 90 degrees and not 60.”
[Cite Office Lecture H. 3. p. 21-7]
10 Jul’62
