ArcGIS Pro 2.7 API Reference Guide
Azimuth Property
Example 

ArcGIS.Core.Geometry Namespace > Coordinate3D Structure : Azimuth Property
Gets the azimuth of the Coordinate3D. The azimuth is measured in radians.
Syntax
public double Azimuth {get;}
Public ReadOnly Property Azimuth As Double
Remarks
The azimuth is the angle between the yz-plane and the Coordinate3D measured in the x-direction. The azimuth is measured in radians in a clockwise direction and has a value between 0 and 2 * PI inclusive.

Coordinate3D

Example
Coordinate3D vector = new Coordinate3D(0, 7, 0);
double azimuth = vector.Azimuth;      // azimuth = 0

vector.SetComponents(1, 1, 42);
azimuth = vector.Azimuth;
double degrees = AngularUnit.Degrees.ConvertFromRadians(azimuth);       // degrees = 45

vector.SetComponents(-8, 8, 2);
azimuth = vector.Azimuth;
degrees = AngularUnit.Degrees.ConvertFromRadians(azimuth);              // degrees = 315
Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

Coordinate3D Structure
Coordinate3D Members