ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Core.Geometry Namespace / LineSegment Class / Length3D Property

Length3D Property (LineSegment)
Gets the 3D length of this instance.
Syntax
public double Length3D {get;}
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 2.1 or higher.
See Also