Kernel::Orientation_2

Orientation	fo.operator() ( Kernel::Point_2 p, Kernel::Point_2 q, Kernel::Point_2 r)
		returns LEFTTURN, if $$r lies to the left of the oriented line $$l defined by $$p and $$q, returns RIGHTTURN if $$r lies to the right of $$l, and returns COLLINEAR if $$r lies on $$l.

See Also