They are polygons.
They have fewer than 5 sides.
They have fewer than 5 vertices.
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There are a total of three parallelograms in a triangular prism. Each of the sides are parallelograms, while the ends are triangles.
only for triangles and parallelograms as far as i know
Pairs of triangles, in general, do not have to be similar.
Nope, never. Parallelograms are classified as having 1 or 2 sets of parallel sides, not triangles.
They're similar triangles.