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On a quick estimate, I would think 18, 9 for each interior side and another 9 for each interior angle.
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A nonagon has only 9 lines so the above answer is nonsense. With 9 lines you can have at most 4 pairs of parallel lines (and one not parallel to any). Or you could have a concave nonagon with 1 pair, 1 triplet and 1 quartet of parallel lines, or some other combination.
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How many pairs of parallel lines does a nonagon have?
A nonagon is a nine-sided polygon. In a nonagon, there are four pairs of parallel lines. This is because the nonagon can be divided into three sets of parallel lines, each containing three parallel lines. Each set of parallel lines consists of three pairs of parallel lines.
How many perpendicular lines are on a nonagon?
A 9 sided nonagon normally has no perpendicular lines that meet at right angles
How many parallel lines does a trangle have?
A triangle can have no parallel lines.
How many pairs of parallel lines does a pentagon have?
A pentagon has no parallel lines.
How many parallel lines are there on a cube?
A cube has exactly 6 parallel lines.
