Principal Vertex
A polygon vertex xi of a simple polygon P is a principal polygon vertex if the diagonal intersects the boundary of P only at x(i−1) and x(i+1). There are two types of principal vertices: ears and mouths.
Read more about this topic: Vertex (geometry)
Famous quotes containing the word principal:
“God should not be called an individual substance, since the principal of individuation is matter.”
—Thomas Aquinas (c. 1225–1274)