The Golden Ratio in Arrangements of an Icosahedron, Tetrahedron, and Octahedron

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A regular octahedron is placed within a regular icosahedron so that eight of its 20 faces lie in the faces of . , in turn, is contained within a regular tetrahedron whose four faces contain four of the eight faces of . The vertices of divide the edges of in the golden ratio . If an edge of is extended in the ratio 1:, then its endpoint is on the edge of that divides it in the golden ratio.

Contributed by: Sándor Kabai (June 2016)
Open content licensed under CC BY-NC-SA


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