The unit vector perpendicular to vectors  is given by,
          Â
We have,
         Â
and       Â
Therefore,
       Â
and    Â
∴       , is the required unit vector.Â
What is the angle betweenÂ
Vector  is perpendicular to the plane containingÂ
       is the resultant of Â
therefore lies in the plane containingÂ
∴  Angle between  and  isÂ
Alternatively:Â Â
If , the do you think that A is necessarily equal to C?
Here, Â Â
Let the angle between  be  and that between  be .
∴      Â
     Â
and       Â
Therefore,
         Â
          Â
Now, Â Â
and       thenÂ
Thus, A is not necessarily equal to C.