| Name | Description |
| CreateExtensionDictionary | Creates a dictionary for the Ellipse or elliptical Arc. |
| DeleteCustomData | Deletes the specified custom data from the Ellipse or an elliptical Arc. |
| DeleteHyperLink | Deletes the hyperlink attached to the Ellipse or elliptical Arc. |
| EvaluateAtDistance | Gets the point on the Ellipse or elliptical Arc closest to the specified distance from the start point. Also gets the corresponding U parameter and two derivatives at that point. |
| EvaluateAtParameter | Gets the point on the Ellipse or elliptical Arc corresponding to the specified U parameter and gets the two derivatives at the point. Also gets the distance of the point from the start point. |
| EvaluateAtPoint | Gets the corresponding U parameter, the distance from the start point, and the two derivatives at the specified point on the Ellipse or elliptical Arc. |
| GetBoundingBox | Gets the bounding box enclosing the Ellipse or elliptical Arc. |
| GetCenter | Gets the center point of the Ellipse or an elliptical Arc. |
| GetClosestPointOn | Gets the point on the Ellipse or elliptical Arc that is closest to the specified point. |
| GetCustomData | Gets the specified custom data for the Ellipse or an elliptical Arc. |
| GetEndParams | Gets the start and end parameters of the Ellipse or elliptical Arc. |
| GetEndPoint | Gets the axis end point of an Ellipse or an elliptical Arc. |
| GetExtensionDictionary | Gets the dictionary for the Ellipse or elliptical Arc. |
| GetHyperLink | Gets the hyperlink attached to the Ellipse or elliptical Arc. |
| GetLength | Gets the length of an Ellipse or elliptical Arc. |
| GetNormal | Gets the vector normal to this Ellipse or elliptical Arc. |
| GetStartPoint | Gets the axis start point of an Ellipse or an elliptical Arc. |
| ReleaseExtensionDictionary | Releases and erases the dictionary for the Ellipse or elliptical Arc, if the dictionary exists and is empty. |
| Select | Adds or removes the selected Ellipse or elliptical Arc to or from the current selection set. |
| SetCenter | Sets the center point of the Ellipse or elliptical Arc. |
| SetCustomData | Sets the custom data for the Ellipse or an elliptical Arc. |
| SetHyperLink | Attaches a hyperlink to the Ellipse or elliptical Arc. |