a triangular pyramid.
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A regular tetrahedron (triangular pyramid).
Because a tetrahedron is a triangular based pyramid that has 4 identical faces and 4 faces meet at all the vertices.
A square which has 4 equal sides
what polygon has 6 edges 4 vertices and all faces meet at vertex
sorry but all i can find is 4 faces 6 edges and 4vertices's :(