50
* * * * *
Or a number smaller than 50 - including zero.
Infinitely many.
A 15 sided polygon has 15 lines of symmetry;) Thanks for asking:)
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.
There are three diagonal lines in a six sided Polygon(Hexagon)
None.
65
5 pairs of parallel sides.
Well a nonagon is a nine sided polygon. If you make the lines or sides parallel, then you will have a parallel figure. Or some parallel lines on a figure (polygon). If you choose to make your polygon (nonagon) have a pair of congruent sides, then your polygon will have some congruent sides. Therefore it really matters what your shape looks like. For example, a quadrilateral can be a square or a kite (or many others but I'm just using these) a kite might have no parallel lines and a square may have 2 sets of parallel lines. Do you get it? Does that answer your question? FYI: A nonagon is also known as a enneagon :)
A regular 24 sided polygon has 24 lines of symmetry.
36
A regular Undegon (11 sided polygon) has 11 lines of symmetry. It also has an order of rotation symmetry of 11.
None. Since the number of sides is odd, there can be no parallel sides.