IsGeographic Property (SpatialReference)
Use WGS84 SpatialReference
SpatialReference wgs84 = SpatialReferences.WGS84;
bool isProjected = wgs84.IsProjected; // false
bool isGeographic = wgs84.IsGeographic; // true
Target Platforms: Windows 11, Windows 10, Windows 8.1
ArcGIS Pro version: 2.0 or higher.