Vertex Definition

Polygons (areas) and polylines (curves) are defined as a series of straight-line segments. The ends of each line segment are defined by a single point (XY coordinate), and this point along an polygon or polyline is called a vertex. When you select a single area or curve and choose the Boundary | Edit Boundaries | Reshape or Draw | Tools | Reshape command, each of the vertices for the selected object is indicated with a hollow box.