Let's be more precise. 360º means the same place, no change in direction. I was using the concept of turn = cycle, so the idea of 360º appeared to me more clear as context was end of a line and beginning of a new one. Obviously to describe the maneuver a U-turn is more accurate, meaning 1/2 a cycle, that is 180º.
An accurate definition rather than doing the maths is the most difficult task !!! :-)
There could be some implicit paradox when I describe the way I did the U-turn. When I refer to length of tractor + plough in terms of diameter it is to express that available area was less (or equal at its best) than the one required for a perfect turn. I was referring, again, to area rather than motion. I should state that apart from using only one brake some back and forward was unavoidable. :-)
All this is to say that I have been plowing land enough to review these and other concepts. For instance, I was trying to relate production per acre in terms of world needs to feed the whole population of this planet. I even rounded our local acre to easily calculate areas of surfaces such as that of Mars or Titan. I was dealing with the exoplanets when I finished the whole land available for this season... :-)
I did so many turns that it is allowed, even if only once, to make a turn = 360º (yes, that means the same place) in order to more accurately check that bunch of primroses I needed to estimate the total number of flowers in the border.
Well..., please don't tell me you still need those :-) things :DDD