In the following picture:

1. You always have right of way (2).
2. Correct answer: You should give right of way to the red vehicle (1) in the roundabout.
3. The driver of the red vehicle should give you right-of-way.
4. You have right-of-way in any case, because you come from the right.

WhyThe red car 1 is already in the roundabout, and you are only entering. In a roundabout you give way to those already in it, whether or not you are on their right.