An octahedron is a polyhedron with eight faces, twelve edges, and six vertices
A 3 dimensional figure
the 3 dimensional shape is a octagon, because their are 8 sides.
It is a triangular prism
a nonahedron.
A pyramid
A dodecahedron is a polyhedron with 12 faces.A dodecahedron is a three-dimensional shape having twelve plane faces.
Octagon. * * * * * An octagon is 2-dimensional. The regular 3-d shape (all faces the same) is the octahedron, but a hexagonal prism also has 8 faces.
If its 2-dimensional then its an octagon, if it is 3-dimensional then it is called an octahedron.
A cube and a cuboid
octahedron
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A polyhedron is a 3-dimensional shape whose faces are all polygons.