The Fourth Triangular Number is 10.
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No. A triangular prism has six vertices. A square pyramid has five vertices. A triangular pyramid has four vertices.
Oh honey, 91 is not a triangular number. Triangular numbers are those that can form an equilateral triangle, like 1, 3, 6, etc. 91 just doesn't make the cut. But hey, at least you asked!
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
A triangular pyramid has 4 vertices, while a triangular prism has 6. Therefore, a triangular prism has 2 more vertices than a triangular pyramid.
Triangular Pyramid......... The faces are Triangular....