(A) the point of first premolar buccal cusp tip;
(B) the point of lateral incisor incisive tip;
(1) shortest distance between the lateral incisor and the first premolar at the approximal contact height area;
(2) a perpendicular line from the midpoint of line 1 to the tangent of line 3 defines the final position of the canine tip after alignment;
(3) tangent line from the lateral incisor incisive to the tip of the first premolar buccal cusp.