Two white (or yellow) parallel lines down the center of a roadway signify No Passing allowed.
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Tow parallel lines could be railroad tracks. Each line of the track remains the exact same distance from the other one for the length of the track.
It is basically a square with two parallel lines that are longer than the other two.
They are: -skew lines -parallel lines -intersecting lines -straight lines -zigzag lines -dotted lines -solid lines -curved lines -perpendicular lines
Technically speaking (in the strict mathematical sense) longitude lines are not parallel, for they do eventually meet. They meet not in one but in two places. I would say however, that they are parallel in the everyday, man-on-the-street sense.
There are three kinds of Lines. A line segment, which has two finite points. A "ray", which has one finite point, and another extending in one direction, and A "line", which figuratively speaking, extends in two opposing directions infinitely. Also, if you're speaking about parallel, perpendicular, etc. A set of parallel lines extend in both directions but never touch (like an equal sign) "=" Perpendicular lines intersect at a 90 degree angle ( like a plus sign ) + Hope I helped!