Nothing.
A perpendicular is an adjective, not a noun. A perpendicular, by itself, cannot exist. A perpendicular bisector, for example, does not have any sides.
it's a something
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They look like an upside-down "T".
A perpendicular bisector has a right angle or 90 degrees
Perpendicular is when two lines cross and form a right angle, which I hope you know what that is.
Perpendicular bisector.
It looks like an upside-down "T".
As far as we know, two lines can be perpendicular, or they can be parallel, but they can't be both.
Is a line that bisects a side of a triangle and is perpendicular to that side.
A perpendicular bisector
it would look weird because that is not possible
It looks like a plus sign (+)