In a plane, if a line is perpendicular to one of two parallel lines, then it is perpendicular to the other.
- In a plane, two lines which are parallel exist in the same axis.
- In essence, any line which is perpendicular to one of two parallel lines is also perpendicular to the other.
- This concept is evident in the model of ladders, where each of the vertical lines are perpendicular to the parallel step lines(horizontal lines).
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