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.
there are 2 sets of parallel lines in a square
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 triangle can have no parallel lines.
it has too parallel lines!
A pentagon has no parallel lines.
A cone does not have any parallel lines
how many sets of parallel lines are in a triangle
A square has 2 pairs of opposite parallel lines.
A cube has exactly 6 parallel lines.
A cube has exactly 6 parallel lines.
2 pairs of parallel lines
A parallelogram has two pairs of parallel lines.