ArcGIS Pro 2.8 API Reference Guide
GeodeticDistanceAndAzimuth Method (IGeometryEngine)
Example 

ArcGIS.Core.Geometry Namespace > IGeometryEngine Interface : GeodeticDistanceAndAzimuth Method
The first input point.
The second input point.
The geodetic curve type.
The azimuth from point1 to point2 in radians.
The azimuth from point2 to point1 in radians.
Calculates distance and azimuth on the spheroid between two points using the given geodetic curve type.
Syntax
Function GeodeticDistanceAndAzimuth( _
   ByVal point1 As MapPoint, _
   ByVal point2 As MapPoint, _
   ByVal curveType As GeodeticCurveType, _
   ByRef azimuth12 As Double, _
   ByRef azimuth21 As Double _
) As Double

Parameters

point1
The first input point.
point2
The second input point.
curveType
The geodetic curve type.
azimuth12
The azimuth from point1 to point2 in radians.
azimuth21
The azimuth from point2 to point1 in radians.

Return Value

Geodetic distance between the two points in meters.
Exceptions
ExceptionDescription
Spatial reference of point1 or point2 is an image coordinate system.
One or both of the input points are null.
Both spatial references of point1 and point2 are null.
Remarks
If point1 or point2 are empty, then azimuth12 = 0, azimuth21 = 0 and the returned geodetic distance is NaN.
Example
SpatialReference sr = SpatialReferences.WGS84;

MapPoint p1 = MapPointBuilder.CreateMapPoint(111, 55, sr);
MapPoint p2 = MapPointBuilder.CreateMapPoint(95.5845, 64.2285, sr);

double distance, az12, az21;

distance = GeometryEngine.Instance.GeodeticDistanceAndAzimuth(p1, p2, GeodeticCurveType.Geodesic, out az12, out az21);
// distance - 1339728.0303777338
// az12 - 326.235780421405
// az21 - 132.87425637913955

distance = GeometryEngine.Instance.GeodeticDistanceAndAzimuth(p1, p2, GeodeticCurveType.Loxodrome, out az12, out az21);
// distance - 1342745.9687172563
// az12 - 319.966400332104
// az21- 139.96640033210397

distance = GeometryEngine.Instance.GeodeticDistanceAndAzimuth(p1, p2, GeodeticCurveType.GreatElliptic, out az12, out az21);
// distance - 1339728.038837946
// az12 - 326.22479262335418
// az21 - 132.88558894347742
Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

IGeometryEngine Interface
IGeometryEngine Members