A square or rectangle
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2 solid shapes together have 8 faces, 12 edges 8 vertices
octagon
1. A cube & 2. A rectangular prism
Vertices are the points where edges meet and form an angle.
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)