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:
“This place is the Devil, or at least his principal residence, they call it the University, but any other appellation would have suited it much better, for study is the last pursuit of the society; the Master eats, drinks, and sleeps, the Fellows drink, dispute and pun, the employments of the undergraduates you will probably conjecture without my description.”
—George Gordon Noel Byron (1788–1824)