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Octahedron - Wikipedia
Octahedron - Shape, Meaning, Formula, Examples - Cuemath
Octahedron - Math.net
Octahedron – Definition, Properties, Formulas, & Diagrams
Regular Octahedron -- from Wolfram MathWorld
Faces, Edges and Vertices of an Octahedron - Neurochispas
Octahedron -- from Wolfram MathWorld
Octahedron - Simple English Wikipedia, the free encyclopedia
Octahedron - Meaning, Properties, Solved Examples and FAQs
The Octahedron - Whistler Alley