Any polygon with more than 3 sides can have two pairs of parallel sides.
If it has only four sides and they make two parallel pairs, then it's a parallelogram.
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A square A parallelogram
A square
Not all polygon have two pairs of parallel sides. For example, a square will, but not a triangle.
A irregular polygon will not have any parallel lines. :)* * * * *Not true. A rhombus is an irregular polygon and it has two pairs of parallel line!An irregular pentagon can have parallel lines.However, a triangle or a conic section cannot.
A diamond has two pairs of parallel lines.