None, for a regular pentagon. Not all pentagons are necessarily regular (all sides and angles the same). You can make a pentagon with 2 pairs of parallel lines. Take a square, and cut off one corner. Now you have a 5-sided polygon (pentagon) with 2 pairs of parallel sides.
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a pentagon has no parallel sides
A pentagon has no parallel sides.
As a regular 5 sided pentagon it has no parallel sides but as an irregular pentagon it can be shaped to have parallel sides.
As a regular 5 sided pentagon it has no parallel sides but as an irregular pentagon it can be shaped to have parallel sides.
It can have none, one or two pairs of parallel sides.