Two adjacent sides of a polygon will meet at a vertex. End points of any other pairs of sides do not have a specific name.
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A polygon, by definition, is a CLOSED plane shape, bounded by straight sides. Every polygon must begin and end at the same point.
The common end point of the sides (or arms) of an angle is the vertex of the angle.
The common end point of the sides of an angle is called the vertex. The sides are referred to as rays.
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vertex