an octagon
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An octagon has 8 sides. An object with 8 faces is an octahedron.
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An octagon is a 2 dimensional object, not a 3 dimensional object. As such, it has 1 face, 8 corners, and 8 angles.
6 faces and 8 vertices.6 faces and 8 vertices.6 faces and 8 vertices.6 faces and 8 vertices.
A cube. Or a triangular bipyramid.
A tetrahedron (or triangular pyramid).
A pentagonal prism has 7 faces - a prism of any 2D object will have (2D sides + 2) faces.e.g. An octagonal prism - 8 side octagon, 8+2=10 face prism.