pe <a href="https://developer.rhino3d.com/api/RhinoCommon/html/T_Rhino_Geometry_PolyCurve.htm" target="_blank" rel="noopener noreferrer">Rhino.Geometry.PolyCurve</a>. When you use instance method syntax to call this method, omit the first parameter. For more information, see <a href="https://docs.microsoft.com/dotnet/visual-basic/programming-guide/language-features/procedures/extension-methods" target="_blank" rel="noopener noreferrer">Extension Methods (Visual Basic)</a> or <a href="https://docs.microsoft.