Yes if its 4 corners meet at right angles.
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I don't know just taking a random guess here lets say.......12 inches
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