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Lumber can mean wood when used as a noun or,if used as a verb, it can mean to move in a slow awkward way.
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.
If you mean a tetrahedron then it is a triangular based pyramid having 4 faces, 6 edges and 4 vertices.
Vertices = Corners