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There are three sides to a triangle.
that's easy peasy a cuboid has 12 edges
There are twp perpendicular edges in a triangular prism. See if you draw a triangle you'll have two angles or edges that are the same length. That is if you draw a standard triangle.
There are many possible solids. A triangle based prism, or a triangle based dipyramid are two examples.
A triangular prism has 9 edges and 5 faces. It also has 6 vertices. A cube has 6 faces and 12 edges.