A cuboid has 3 quartets of parallel lines. Each quartet gives rise to six pairs. So, in all there are 18 pairs of parallel lines.
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People say it’s 3 and some other people say that it has 18 so I don’t really know which one ☝️?
I'm pretty sure it is 12 pairs of parallel lines.
A rhombus has 2 pairs of parallel lines.
A regular dodecagon has six pairs of parallel lines.
A regular octagon has four pairs of parallel lines.
A square has 2 pairs of equal opposite parallel lines