CGAL::circumcenter

Point_2<Kernel>	circumcenter ( Point_2<Kernel> p, Point_2<Kernel> q, Point_2<Kernel> r)
		compute the center of the circle passing through the points $$p, $$q, and $$r. Precondition: $$p, $$q, and $$r are not collinear.
Point_2<Kernel>	circumcenter ( Triangle_2<Kernel> t)
		compute the center of the circle passing through the vertices of $$t. Precondition: $$t is not degenerate.
Point_3<Kernel>	circumcenter ( Point_3<Kernel> p, Point_3<Kernel> q, Point_3<Kernel> r)
		compute the center of the circle passing through the points $$p, $$q, and $$r. Precondition: $$p, $$q, and $$r are not collinear.
Point_3<Kernel>	circumcenter ( Triangle_3<Kernel> t)
		compute the center of the circle passing through the vertices of $$t. Precondition: $$t is not degenerate.
Point_3<Kernel>	circumcenter ( Point_3<Kernel> p, Point_3<Kernel> q, Point_3<Kernel> r, Point_3<Kernel> s)
		compute the center of the sphere passing through the points $$p, $$q, $$r, and $$s. Precondition: $$p, $$q, $$r, and $$s are not coplanar.
Point_3<Kernel>	circumcenter ( Tetrahedron_3<Kernel> t)
		compute the center of the sphere passing through the vertices of $$t. Precondition: $$t is not degenerate.