Folding a Net into an Octahedron Or Two Tetrahedra
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The Demonstration shows that the surface of a regular octahedron can be rearranged to form the surfaces of two regular tetrahedra.
Contributed by: Izidor Hafner (August 2013)
Open content licensed under CC BY-NC-SA
 G. N. Frederickson, Dissections: Plane & Fancy, New York: Cambridge University Press, 1997 p. 246. www.cs.purdue.edu/homes/gnf/book.html.
"Folding a Net into an Octahedron Or Two Tetrahedra"
Wolfram Demonstrations Project
Published: August 12 2013