In geometry, an edge is a one-dimensional line segment joining
two zero-dimensional vertices in a polytope. Thus applied,
an edge is a connector for a one-dimensional line segment
and two zero-dimensional objects.
The vertex of an angle is the point where two rays begin or
meet, where two line segments join or meet, where two lines
cross (intersect), or any appropriate combination of rays,
segments and lines that result in two straight sides meeting
at one place.