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Bible Encyclopedias
Octahedron

1911 Encyclopedia Britannica

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(Gr. 6KT6, eight, Spa, base), a solid bounded by eight triangular faces; it has 6 vertices and 12 edges. The regular octahedron has for its faces equilateral triangles; it is the reciprocal of the cube. Octahedra having triangular faces other than equilateral occur as crystal forms. See Polyhedron and Crystallography.

Bibliography Information
Chisholm, Hugh, General Editor. Entry for 'Octahedron'. 1911 Encyclopedia Britanica. https://www.studylight.org/​encyclopedias/​eng/​bri/​o/octahedron.html. 1910.
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