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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
one of the five regular polyhedrons. An octahedron has eight faces (triangles), 12 edges, and six vertices; at each vertex four edges meet. If a is the length of an edge, then the octahedron’s volume is .
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.