They still look parallel but in the vertical plane.
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Like this -> Vertical would be top to bottom, which goes from 0 to 180 degrees Horizontal would be left to right, which goes from 90 to 270 degrees Lines are parallel when their angles and orientations are the same. Therefore you can also have diagonal (corner to corner) parallel lines as well.
A vertical line has an undefined slope. For the line to be parallel to a vertical line, the slopes would have to be the same. Therefore, the line parallel to a vertical line also has an undefined slope.
all vertical lines are parallel to waht type of line?
Two lines, in 3-dimensional space must either intersect, be parallel or be skew. In the first two cases, they are coplanar which leaves skew lines.One way to "see" what they look like is to imagine you are standing in a cuboid room. Consider the edge where the walls on your left and the one facing you meet. Next, consider any non-vertical line of the wall to your right. [A vertical line will be parallel to the first]. These two lines will be skew. They are not parallel and also they never intersect.
Just like this: ___________________ ____________________ parallel means they never intersect (touch)