ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Core.Geometry Namespace / Polygon Class / IsExteriorRing Method

IsExteriorRing Method
Overload List
OverloadDescription
Determines if the specified part of this polygon is an exterior ring.  
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 2.7 or higher.
See Also