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CGAL::collinear

bool collinear ( Point_2<Kernel> p, Point_2<Kernel> q, Point_2<Kernel> r)
returns true, iff p, q, and r are collinear.

bool collinear ( Point_3<Kernel> p, Point_3<Kernel> q, Point_3<Kernel> r)
returns true, iff p, q, and r are collinear.

See Also

CGAL::left_turn
CGAL::orientation
CGAL::right_turn

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CGAL Open Source Project. Release 3.4. 22 January 2009.