These lines are perpendicular: _|
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Perpendicular and parallel lines are two examples.
As far as we know, two lines can be perpendicular, or they can be parallel, but they can't be both.
stand up... that is a perpendicular line right there. you are 90 degrees with respect to the floor.
Take any two lines and look at their slopes. -- If the slopes are equal, then the lines are parallel. -- If the product of the slopes is -1, then the lines are perpendicular.
the Horizontal line of you bed to the vertical lines of your bedposts