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CGAL::angle

Angle angle ( Point_2<Kernel> p, Point_2<Kernel> q, Point_2<Kernel> r)
returns OBTUSE, RIGHT or ACUTE depending on the angle formed by the three points p, q, r (q being the vertex of the angle).

Angle angle ( Point_3<Kernel> p, Point_3<Kernel> q, Point_3<Kernel> r)
returns OBTUSE, RIGHT or ACUTE depending on the angle formed by the three points p, q, r (q being the vertex of the angle).

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CGAL Open Source Project. Release 3.6.1. 29 June 2010.