The answer depends on where A is and where the perpendicular is. And since you have not bothered to share these crucial bits of information, I cannot provide a more useful answer.
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The question given is quite vague and unclear but in general perpendicular lines meet each other at right angles which is 90 degrees.
yes it is perpendicular
It could be but does not have to be... (Perpendicular to what?)
Mutually perpendicular, adjacent sides.Mutually perpendicular, adjacent sides.Mutually perpendicular, adjacent sides.Mutually perpendicular, adjacent sides.
No but its diagonals are perpendicular