it can be three dimensional. a polygon is three sided or more like a triangle. so to answer your question, yes.
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An octahedron is not a polygon. A polygon is a two dimensional shape. An octahedron is a three dimensional shape and is classified as a polyhedron.
a polygon(or polyhedron) is a three dimensional figure that has straight edges. * * * * * A polygon is 2 dimensional, a polyhedron is 3-d.
A polygon is a 2-dimensional closed figure that has at least three sides. A pentagon is a 2-dimensional closed figure that has five and only five sides, so it is a kind of polygon.
An octahedron is an eight-sided polyhedron (which is a three-dimensional polygon).
It could be a pyramid.