It has a 90degree angle. You should stand up and then notice that you are a perpendicular line to the floor since you are 90degrees to the floor if you stand exactly straight up.
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As far as we know, two lines can be perpendicular, or they can be parallel, but they can't be both.
These lines are perpendicular: _|
They look like two intersecting lines that make four right angles. Like the two lines in this L.
They are straight lines that intersect each other at 90 degrees