| IArcEdge(PointD, PointD, PointD) | Create a new IArcEdge with start, end and center. Internal the arcedges has less equal or then 90 degree. |
| IArcEdge(PointD, PointD, PointD, Double, Boolean) | Create a new IArcEdge with start, end and center. Internal the arcedges has less equal or then 90 degree. |