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A line that is going straight up is perpendicular to the floor. A line that is leaning over is not perpendicular to the floor.
stand up... that is a perpendicular line right there. you are 90 degrees with respect to the floor.
Yes. Take a look at the corner of your room, where two walls meet the floor.
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.
These lines are perpendicular: _|