4
Chat with our AI personalities
At least two pairs: they form the outer rectangle which represents the "universe".
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.
4
Yes,I think it has got one
Four.