Four.
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Four.
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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).
A tetrahedron has 4 faces.
There are 4 vertices does the tetrahedron have