In the shown fig . 5.12 (a) , (b) and (c ) , find the angle between A and B .
(b)
.

Explanation

If we draw both the vectors from one point with their arrows outwards, then they can be shown as below In Fig (a) `theta = 45^(@)`
In fig (b) `theta = 150^(@)` and
In fig (c) `theta = 35^(@)`