Which term is the point common to the two rays that form the sides of a polygon?

• A. Power
• B. Width
• C. Vertex
• D. Radical

Answer: (C)

The point common to two rays that form the sides of a polygon is a vertex. In a polygon, each side is a straight segment, and two neighboring sides meet at a shared endpoint. That shared point is the vertex, the location where the interior angle of the polygon is formed. If you extend each side beyond that meeting point, you get two rays that both start at the same vertex, illustrating why that point is described as the vertex.

The other terms don’t fit this idea: power relates to exponents, width is a measurement of dimension, and radical involves roots. None of these names the meeting point of two sides of a polygon.