But it wouldn't be at right angles to the NDB in that case would it? Because your track is actually 170M. I give up, I hope there aren't too many questions about NDB. VOR I'm absolutely fine with.
The plonkers who write the questions don't think the way you (or I) do when they say "at right angles" they really mean that your aeroplane is due West of the NDB. They expect you to do the calculation I did which actually does show the picture you would see in the cockpit when due west of the NDB on a heading of 166.