In theory, yes. I think the idea is that if you make a circle big enough, it will be larger than the universe and will functionally be a flat line.
So therefore you can treat every line as if it were a very large circle.
Alternatively, you can treat every line as if it is a circle viewed on its side with the radius the same as the 1/2 the width of the length.
Or, you can view a line as an ellipse but with radii that are so far apart that the top and bottom of the ellipse touch one another, forming a line.
It all feels like cheating to me but apparently a LOT of mathematics works this way. It continues to surprise me.