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There is no 3d shape made up of octagons.

An octahedron can be one of several different shapes - but without ANY octagonal faces. For example,

A hexagonal pyramid (8 faces, 18 edges, 12 vertices)

A heptagonal pyramid (8 faces, 14 edges, 8 vertices)

A quadrilateral dipyramid (8 faces, 12 edges, 6 vertices)

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Q: How many faces edges and vertices does a 3d octagon have?
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