Step 1 :  

Definition of orthogonal vectors :  

The vectors u and v are orthogonal if

Definition of vector components :

Let u and v be nonzero vectors such that

where and are orthogonal vectors.

The vector is the projection of u onto v and it is denoted by

And

Projection of u onto v :

Let u and v be non zero vectors. The projection of u onto v is

Step 2 :

The vectors are and

The projection v onto u :

Step 3 :

Evaluation of :

The value of other orthogonal vector

 Solution :

The projection v onto u :

The value of other orthogonal vector is