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two parallel lines are crossed by another line ,that's the perpendicular.
it depends on how you place it, they can be. all a line segment is is a straight line, if you have two you can have parallel or crossing lines.
At their point of crossing, the space between two crossnig line is 0. From any point on either line you can always drop a perpendicular to the other line and this will be the shortest distance from that point to the other line.
Perpendicular lines are where a line crosses another line and forms 4 right angles on all 4 sides but a intersecting line only crosses another line
the four lines you are adding five line to are vertical.