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.
On a quick estimate, I would think 18, 9 for each interior side and another 9 for each interior angle. * * * * * 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.
A pentagon has no parallel lines.
Here are three shapes that have two pairs of parallel lines: square parallelogram rectangle There are many polygons with at least two pairs of parallel lines. hexagon (has 3 pairs of parallel lines) octagon (has 4 pairs) decagon (has 5 pairs)
0 pairs
A regular pentagon has no parallel lines.
A nonagon, which is a polygon with nine sides, can have multiple pairs of parallel lines depending on how it is drawn. However, in a regular nonagon, no sides are parallel because all sides are of equal length and the angles are equal. In general, the number of parallel lines in any polygon depends on its specific arrangement and shape. Therefore, a nonagon can have zero or more pairs of parallel lines, but typically a regular nonagon has none.
In a regular nonagon no two sides are parallel.
Up to four.
A diamond has two pairs of parallel lines.
On a quick estimate, I would think 18, 9 for each interior side and another 9 for each interior angle. * * * * * 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.
A rhombus has 2 pairs of parallel lines.
A regular dodecagon has six pairs of parallel lines.
it has 2 pairs of parallel lines
A pentagon has no parallel lines.
it has too parallel lines!
A square has 2 pairs of equal opposite parallel lines
A regular octagon has four pairs of parallel lines.