A right hendecagon can have no parallel sides because there are eleven sides to a hendecagon. It is not a requirement that there be any pairs of parallel sides in an irregular hendecagon, although there could be one or more pairs.
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A square has two pairs of parallel sides.It has two pairs of parallel sides.
It has 2 pairs of parallel sides
A parallelogram has two pairs of parallel sides.
A parallelogram has two pairs of opposite parallel sides
A parallelogram has 2 pairs of parallel sides