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Considering that any two edges that meet at 90 degrees are perpendicular, there are 3 per corner, giving a total of 24.
Any shape with straight edges can have perpendicular edges.
False, the prism can be of any length.
Infinitely many. Every possible triangle can be used to generate a triangular prism, and in each case, the prism can have any one of infinitely many lengths.
A triangular prism, a triangle base and three triangular faces (a tetrahedron)The figures below do not strictly have a "base" but they are composed entirely of trianglesAn octohedron (eight sides)An isocahedron (20 identical equilateral triangular faces, 30 edges and 12 vertices)Any of a number of deformations of the above