rectangular pyramid
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A triangular pyramid has 4 faces and has 6 edges
A square pyramid
A pyramid with a triangular base. The faces are 4 equilateral triangles.
There is no solid figure with only four edges. The smallest solid figure is the tetrahedron, made up of four triangular faces, but it has six edges.
It is a tetrahedron which is a triangular based pyramid having 4 faces, 6 edges and 4 vertices