Not all polygons have an 'official' name. It is quite acceptable to call a polygon using the number of sides it has. For example a 101ogon.
There is a list of some polygons names listed in the related question.
There are not many common nonagonal shapes. Some coins are nonagonal.
One shape cannot be congruent: you need two (or more) shapes which can be congruent to each other.
Some of them are: triangle, quadrilateral, pentagon, hexagon, heptagon, octagon, nonagon, decagon ..... etc
A nonagon here are all the shapes and sides for help all are 2D shapes Circle=1 Not sure about this one Triangle=3 Square=4 Pentagon=5 hexagon=6 heptagon=7 octagon=8 nonagon=9 decagon=10
Triangle and decagon; Quadrilateral and enneagon/nonagon; Pentagon and octagon; Hexagon and heptagon.
Nonagon is a noun referring to a polygon with nine sides and nine angles (corners). Here are example sentences: "At first glance, people might not distinguish between a nonagon and a decagon." "Traffic signs come in various shapes, such as an octagon for the stop sign, but they do not come in the shape of a nonagon.
Nonagon
2D - Nonagon 3D - Nonahedron
In geometry, an enneagon or nonagon is a nine-sided polygon. The name enneagon comes from Greek enneagonon.
There are no parallel sides on a nonagon (nine-sided figure)... Regular shapes with an odd-number of sides have no parallel sides.
because there are to many sides * * * * * Each interior angle of a regular nonagon is 140 degrees. At any point in the tessellated plane, a whole number of shapes must come together and the sum of their interior angles must be 360 degrees. 140 does not go into 360 and so a regular nonagon cannot tessellate.
triangle pentgon heptagon nonagon etc.
Triangle Pentagon Septagon Nonagon Etc
Greek
There are not many common nonagonal shapes. Some coins are nonagonal.
nonagon true but is there anymore shapes that have 9 sides?
Some of them are: triangle, quadrilateral, pentagon, hexagon, heptagon, octagon, nonagon, decagon ..... etc