"Octagonal" is an adjective. That is not enough information. Is it an octagonal prism, octagonal pyramid, octagonal bipyramid or something else? Each one would lead to a different answer.
An octagonal prism has: 10 faces 16 vertices and 24 edges :)
Octagonal pyramid: 9 faces 16 edges 9 vertices.
An octagonal pyramid has9 faces 9 vertices 16 edges.
An octagonal pyramid has 9 faces, 9 vertices, 16 edges.
An octagonal prism has: 10 faces 16 vertices and 24 edges :)
Faces = 9 Vertices = 9 Edges = 16
Faces: 10 Vertices: 16 Edges: 24
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It has 16 vertices and 10 faces. It is an octagonal prism.
Faces=9 Vertices: 9 Edges=16
An octagonal prism has 10 faces, 24 edges and 24 edges(!) Oh, and in case you are interested, 16 vertices.
Faces= 9Edges = 16Vertices = 9