Honestly, why did I get down voted for that? If it was a circle and you grabbed a rope and fell, centrifugal force would eventually build to the point where you're thrown off.
Thank you, sir, for introducing logic to the internet (where its absence has been painfully noticeable). This post intrigued me, and your comment satisfactorily resolved the quandry. Good morrow :)
I'm not sure how this could ever be seen as a circle... the rope isn't looping around to be tied to itself, that's not how portals (or worm holes) work.
There is no evidence that the two "portals" are connected in anyway. And even if they were, it would not create a complete circle. The definition of a circle is "a line with no beginning or end that measures the same from any point in the line to the center. When you step halfway into a portal, you are not making your body stand in a circular position. You are simply two places in one time.
It is not a circle as such, but it could be considered a loop. The single length of rope is self-attached at its ends, which without portals would make it a loop. Portals essentially represent the same plane in space, so if you took the cross-section of a loop, it could be where the portals are placed. It is also a straight line, in this special case where the portals face each other, because at any point along the rope the tangent is that same line.
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