The three faces of the prism may be, but are not necessarily, rectangles. It depends on how the ends of the prism are cut/shaped.
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a triangular prism has to triangular bases while a rectangular prism has a rectangle as the bases.
Cuboid or a triangular prism
Triangular faces (and cross section).
One is a triangle base...and the other a rectangle..
The answer depends on the orientation of the prism. Generally, the top view is a rectangle. The side view is either a triangle, a parallelogram or a rectangle, depending on the position.