Angle Between vectors in Navigation Mesh

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I need to find the angle between the blue vector and the black vector.
Trying to use the function Vector3.Angle() but i don’t know how to find those 2 vectors.

Tried using *.steeringTarget and *.nextPosition but it didnt work so far.

If anyone was wonderin,
blue vector:
navmesh.steeringTarget-gameObject.transform.position

black vector:
gameObject.transform.forward;