'two perpendicular number lines are called'
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the parallel lines never intersect each other but they both intersect the line they are perpendicular to
parallel lines
Parallel lines run in the same direction. If they are intersected by one line and that line is perpendicular to both, then it proves that the lines run parallel to each other.
No they are perpendicular if the intersect at a right angle. + is perpendicular, = is parallel
perpendicular line