EllipseArc
public static EllipseArc ByPlaneRadiiAngles(Plane plane, double xRadius = 1, double yRadius = 1, double startAngle = 0, double sweepAngle = 180)
public static EllipseArc ByPlaneRadiiStartAngleSweepAngle(Plane plane, double xRadius = 1, double yRadius = 1, double startAngle = 0, double sweepAngle = 180)