CSHARP

unity get distance between two objects

// Vector3.Distance is the same as (a-b).magnitude

float distance = Vector3.Distance(a.transform.position, b.transform.position);

unity distance between 2 vectors 2d

Vector2.Distance(vector1.position, vector2.position);

distance between two objects unity 2d

public GameObject object1;
public GameObject object2;
void Update()
{
  Vector2 Pos1 = object1.transform.position;
  Vector2 Pos2 = object2.transform.position;
  float x1 = Pos1.x, x2 = Pos2.x, y1 = Pos1.y, y2 = Pos2.y;
  // Distance between X coordinates
  float xDif = Mathf.Abs((Mathf.Max(x1,x2) - Mathf.Min(x1,x2));
  // Distance between Y coordinates
  float xDif = Mathf.Abs((Mathf.Max(y1,y2) - Mathf.Min(y1,y2));
  // Pythagorean theorem
  float finalDistance = Mathf.Sqrt(xDif * xDif + yDif * yDif);
  Debug.Log("Distance Between Object1 And Object2 Is " + finalDistance);
}