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A cube is different to a rectangular prism because in a cube all the edges have to be equal in length, where's in a rectangular prism the edges can be of various lengths.
It is impossible to tell. You need to know a rectangular WHAT? A rectangular prism, a rectangular pyramid, a rectangular dipyramid, etc will all give different answers.
A cube is a regular rectangular prism. Regular requires all its edges to be of the same length.
Not all edges are parallel to each other, only the opposite edges are parallel to each other
A triangular prism - if the three rectangular face are not ALL the faces.