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CGAL::left_turn

bool
left_turn ( Point_2<Kernel> p,
Point_2<Kernel> q,
Point_2<Kernel> r)
returns true iff p, q, and r form a left turn.

See Also

CGAL::collinear
CGAL::orientation
CGAL::right_turn

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The CGAL Project . Tue, December 21, 2004 .