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Yes,I think it has got one
Oh, dude, a heptagon has like a bazillion pairs of perpendicular lines... just kidding! It actually has 14 pairs of perpendicular lines. So, like, if you ever need to find perpendicular lines in a heptagon, you've got plenty to choose from.
A square has four perpendicular sides.
At least two pairs: they form the outer rectangle which represents the "universe".