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CGAL::normal

Vector_3<Kernel> normal ( Point_3<Kernel> p, Point_3<Kernel> q, Point_3<Kernel> r)
computes the normal vector for the vectors q-p and r-p.
Precondition: The points p, q, and r must not be collinear.

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CGAL Open Source Project. Release 3.5.1. 19 December 2009.