No not always as for example a 3 sided triangle has no parallel sides
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Not all polygon have two pairs of parallel sides. For example, a square will, but not a triangle.
A square is a four-sided polygon with two congruent parallel sides.
Any polygon with 4 or more sides can have 2 parallel sides.
General term for a polygon with 4 sides is a quadrilateral. A parallelogram is the special case with two pairs of parallel sides.
You can construct any polygon with more than 4 sides such that two sides are parallel. A quadrilateral in which two lines are parallel is called a trapezoid.