There is no such word as a dectagon. And since it could refer to an octagon or a decagon (or possibly something else), it is not possible to give a sensible answer. Please correct your spelling and resubmit the question. If either octagon or decagon, they need not have any parallel lines.
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There is no such word as a dectagon. And since it could refer to an octagon or a decagon (or possibly something else), it is not possible to give a sensible answer. Please correct your spelling and resubmit the question.Assuming that the question is meant to be about some polygon, it need not have any lines of symmetry.
Two
A square has 2 pairs of opposite parallel lines.
There cannot be parallel lines in any [plane] triangles.
A triangular prism has 9 parallel lines