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[Wang Hetao <>]

Thx for your answer. I see now that I can construct an arrangement *arr* by
inserting all the circles and the circle center *center* in. Since *center*
is a isolated point, I can get the face which *center* is in by applying
face() on it and the face is represented by a set of halfedges in
couter-clockwise.

Since I got all the edges covering a face, but they are stored in CGAL as
Arr_circle_segment_traits_2<Kernel>::X_monotone_curve_2 internally. There is
no further explanations about it. I'd like to know how could I use this type
properly or may I convert it into 
Circular_arc_2<CGAL::Exact_circular_kernel_2>. I have tried
CGAL::object_cast() but it does not work.



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