Three vectors ` vecA , vecB , vecC ` are shown in the figure angle between (i) ` vecA and vecB (ii) vecB and vecC ,(iii) vecA and vecC`

Explanation

To find the angle between two vectors we connect the tails of the two vectors. We can shift the vectors parallel to themselves such that tails of A, B and are connected as shown in figure.

Now we observe that angle between `vecA and vecB` is `60^(@` B and C is `15^(@)` and between `vecA and vecC` is `75^(@)`