lw_dist2d_arc_arc_concentric()

int lw_dist2d_arc_arc_concentric	(	const POINT2D *	A1,
		const POINT2D *	A2,
		const POINT2D *	A3,
		double	radius_A,
		const POINT2D *	B1,
		const POINT2D *	B2,
		const POINT2D *	B3,
		double	radius_B,
		const POINT2D *	CENTER,
		DISTPTS *	dl
	)