public new EllipticArcSegment ToSegment()

{
  // Construct a circular arc from (2, 1) to (1, 2) with interior pt (1 + sqrt(2)/2, 1 + sqrt(2)/2).
  // Use a builderEx convenience method or use a builderEx constructor.

  MapPoint fromPtCircArc = MapPointBuilderEx.CreateMapPoint(2, 1);
  MapPoint toPtCircArc = MapPointBuilderEx.CreateMapPoint(1, 2);
  Coordinate2D interiorPtNew = new Coordinate2D(1 + Math.Sqrt(2) / 2, 1 + Math.Sqrt(2) / 2);

  // BuilderEx convenience methods don't need to run on the MCT.
  EllipticArcSegment circularArcBuilder = EllipticArcBuilderEx.CreateCircularArc(fromPtCircArc, toPtCircArc, interiorPtNew);

  // BuilderEx constructors don't need to run on the MCT.
  EllipticArcBuilderEx eab = new EllipticArcBuilderEx(fromPtCircArc, toPtCircArc, interiorPtNew);
  // do something with the builder

  EllipticArcSegment anotherCircularArc = eab.ToSegment();
}

{
  // Construct a circular arc counterclockwise from (2, 1) to (1, 2) such that the embedded 
  // circle has center point at (1, 1) and radius = 1.
  // Use a builderEx convenience method or use a builderEx constructor.

  MapPoint fromPtArc = MapPointBuilderEx.CreateMapPoint(2, 1, SpatialReferences.WGS84);
  double chordLength = Math.Sqrt(2);
  double chordBearing = 3 * Math.PI / 4;
  double radius = 1;
  ArcOrientation orientation = ArcOrientation.ArcCounterClockwise;
  MinorOrMajor minorOrMajor = MinorOrMajor.Minor;

  // BuildeEx convenience methods don't need to run on the MCT.
  EllipticArcSegment circularArcBuilder = EllipticArcBuilderEx.CreateCircularArc(fromPtArc, chordLength, chordBearing, radius, orientation, minorOrMajor);

  // BuilderEx constructors don't need to run on the MCT either.
  EllipticArcBuilderEx ellipticArcBuilderEx = new EllipticArcBuilderEx(fromPtArc, chordLength, chordBearing, radius, orientation, minorOrMajor);
  // do something with the builder

  EllipticArcSegment anotherCircularArc = ellipticArcBuilderEx.ToSegment();
}

{
  // Construct a circular arc with center point at (0, 0), from angle = 0, 
  // central angle = pi/2, radius = 1.
  // Use a builderEx convenience method or use a builderEx constructor.

  SpatialReference sr4326 = SpatialReferences.WGS84;
  Coordinate2D centerPt = new Coordinate2D(0, 0);
  double fromAngle = 0;
  double centralAngle = Math.PI / 2;
  double radius = 1;

  // BuilderEx convenience methods don't need to run on the MCT.
  EllipticArcSegment circularArcBuilder = EllipticArcBuilderEx.CreateCircularArc(fromAngle, centralAngle, centerPt, radius, sr4326);

  // BuilderEx constructors don't need to run on the MCT.
  EllipticArcBuilderEx ellipticArcBuilderEx = new EllipticArcBuilderEx(fromAngle, centralAngle, centerPt, radius, sr4326);
  ellipticArcSegment = ellipticArcBuilderEx.ToSegment();
}

{
  //Note: Must be on QueuedTask.Run(() => { ...
  //Build geometry
  Coordinate2D center = new Coordinate2D(4.5, 4);
  var eabCir = new EllipticArcBuilderEx(center, 0.5, ArcOrientation.ArcClockwise);
  var cir = eabCir.ToSegment();

  var poly = PolygonBuilderEx.CreatePolygon(
    PolylineBuilderEx.CreatePolyline(cir, AttributeFlags.AllAttributes));

  //Set symbology, create and add element to layout
  CIMTextSymbol sym = SymbolFactory.Instance.ConstructTextSymbol(
                  ColorFactory.Instance.GreenRGB, 10, "Arial", "Regular");
  string text = "Circle, circle, circle";

  GraphicElement cirTxtElm = ElementFactory.Instance.CreateTextGraphicElement(
    layout, TextType.CircleParagraph, poly, sym, text, "New Circle Text", false);
}

{
  //Note: Must be on QueuedTask.Run

  //Build geometry
  Coordinate2D center = new Coordinate2D(4.5, 2.75);
  var eabElp = new EllipticArcBuilderEx(center, 0, 1, 0.45, ArcOrientation.ArcClockwise);
  var ellipse = eabElp.ToSegment();

  var poly = PolygonBuilderEx.CreatePolygon(
    PolylineBuilderEx.CreatePolyline(ellipse, AttributeFlags.AllAttributes));

  //Set symbology, create and add element to layout
  CIMTextSymbol sym = SymbolFactory.Instance.ConstructTextSymbol(
                        ColorFactory.Instance.BlueRGB, 10, "Arial", "Regular");
  string text = "Ellipse, ellipse, ellipse";

  GraphicElement ge = ElementFactory.Instance.CreateTextGraphicElement(
    layout, TextType.PolygonParagraph, poly, sym, text, "New Ellipse Text", false);
}