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Not only that; to be "perpendicular", they have to cross at an angle of 90 degrees.
When two perpendicular lines cross, a right angle is formed.
Angles that cross are called perpendicular angles.
Longitude and latitude lines are perpendicular to each other. Most road intersections in major cities are set up in a grid, making the cross streets perpendicular.
Railroad tracks or the number 11 are parallel lines. A cross or a small t are perpendicular lines. Also the two ll's in the middle of parallel are parallel lines.