The angle between the isometric axes is                   

1. 180 degrees
2. 60 degrees
3. 90 degrees
4. 120 degrees

Answer: d

Explanation:

Isometric projection is a type of projection in which the three dimensions of a solid are not only shown in one view but also their actual sizes can be measured directly from it.

So it is needed that there exist equal angle between the axes for easy measurement

so 360/3=120 degrees is chosen.