square. hexagon nonagon octagon etc.
it means you have a 9-gon that has all equal sides and all angle measures are congruent
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 :)
nonagon
Because nonagon means 9 sides
Not a regular nonagon.
A nonagon has nine sides.
A nonagon
"nonagon" is not a prefix.
Nonagon.
a nonagon
A nonagon.