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A quadrilateral based pyramid.
A triangular prism
5 faces 6 corners 9 edges
A triangular has 5 FACES,6 CORNERS and 6 EDGES
5 faces 8 edges 5 corners (vertexes) * * * * * Wrong! The answer given above is for a SQUARE based pyramid. A triangle based pyramid, or a tetrahedron, has 4 faces, 6 edges and 4 corners (vertices).