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In a two-dimensional (2-D) movie, all images are on a flat screen. Three-dimensional (3-D) movies are made to appear as if some objects, people, etc. are in front of others.
There's no such thing as a two dimensional rectangular prism for a prism is three dimensional.
It can be any 2-dimensional figure.
It is a three dimensional figure of some sort.
There are infinitely many different plane figures that can be made up of 2-dimensional shapes - provided that they are all in the same plane. There cannot be any 3-dimensional shapes involved.