parallel isn't a case of direction, it just means two lines that will never bisect (check out the "L"s in parallel).
There is the 49th degree North parallel but it is really just a line of latitude.
also, just for clarification, horizontal is going across (just think of the horizon) and vertical is going up.
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Parallel lines are lines that, if extended, would never intersect with eachother. This means that they are going in the same direction, eg. | |, but not | \. Horizontal means that that are going across, eg. ___________________, not |. An example of a lines that are parallel and horizontal: _____________________________________ _____________________________________
when it is a parallel line across the x and y axis
It means two things going side by side in the same direction. ============ Those lines are parallel
parallel lines are used in the white house. The columns holding it up are parallel lines and the floor and the roof of a room are parallel planes as long as they are the same shape
2 because the top and bottom are going the same direction. While the line in the middle is going diagnally