CGAL::coplanar

bool
coplanar ( Point_3<Kernel> p,
Point_3<Kernel> q,
Point_3<Kernel> r,
Point_3<Kernel> s)
returns true, if p, q, r, and s are coplanar.

See Also

CGAL::coplanar_orientation
CGAL::coplanar_side_of_bounded_circle