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If you mean a tetrahedron then it is a triangular based pyramid having 4 faces, 6 edges and 4 vertices.
Pentagon
A polygon is a shape with these characteristics: •At least 3 sides •No curved edges •No crossing edges •Closed edges; all edges MUST connect at a corner.
Edges are one dimensional objects where two planes meet.
It is an octahedron which is one of the Platonic Solids having 8 equilateral triangular faces and 12 edges.