Parallel two-wire transmission line?

two line segments that are not parallel are intersecting even if they don't touch like this /l/ lthey are considered intersecting because you must extend it like they are lines to say they are...

Transversal, I think http://www.mathopenref.com/anglestransexterior.html

I guess that would also make them parallel to each other.

a transversal lineIf a transversal intersects two parallel lines, then the alternate interior angles are congruent.

Not necessarily.The Tropic of Cancer, and the Tropic of Capricorn, imaginary lines on the surface of the earth (an approximate sphere), are parallel but they are not coplanar. You could draw similar...