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:
“The principal point of cleverness is to know how to value things just as they deserve.”
—François, Duc De La Rochefoucauld (1613–1680)