I could have sworn when i read the dot one at first it said 3 lines, and was thinking the same thing that DanielB posted. Even if the dots 'have no size' which is physically impossible cause then there would be no dots

if you draw the lines far enough out, then their 'slope' will be essentially nothing and the 3 lines would appear parallel to the naked eye.

So im gonna go with DanielB's solution working for 3 lines, but the riddle stats using only 4 lines...so as an answer to that, DanielB is one line short, therefore his answer doesnt work

-Darth Simon

*edited cause i cant spell