i think its when you are make a float and you put a soda in it in it foams a float
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Four straight lines
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.
No. No. No. No.
As "straight" is 1 syllable, it would simply be "straight".
Angles on a straight line add up to 180 degrees