Are multiple overlapping (p)lines parallel?

[Anonymous]

Hello, 

I'm interested if there is a command which can check if multiple overlapping lines are parellel.

I am using AutoCAD Map 3D 2017

[ChicagoLooper · Accepted solution]

Sorry, there is no command that can do that. 

BTW, many forum users and other semi-important people would like to know why you need to know that?!? Please give a detailed explanation. There might be another way to accomplish your goal WITHOUT using parallel lines.

The only work-a-round would be to perform a fillet with radius=0. If you can fillet then the lines are NOT parallel. If you cannot fillet then the lines are parallel.

<<You cannot fillet parallel lines!>>

[Anonymous]

Many of my drawings require overlapping and adjacent rectangles. It often happens when I zoom in real close, lines aren't on top of each other, or appear not to be. Sometimes I can draw pline between two points (which were supposed to be one on top of other) but the length is 0.0000. 
I can't figure out how to avoid that problem, especially since I don't have Nearest on Object snap on.

Therefore, I would like to easily check if sides of rectangles are parallel. My current way of doing it is drawing xline and then zooming in and out like a maniac.

Thank you for the answer!