Only one polygon has a name starting with the letter "a". It is called the "Apeirogon", and it is a polygon with infinite sides.
Quadrilaterals are 4 sided polygons
How about a decagon which is a ten sided polygon
A regular polygon
It is not a polygon
It is not a polygon, because a polygon is a closed figure.
The block capital letter H is a 12 sided polygon.
No.
by every letter on the vertex or side you can put a letter and that will name the polygon.
polygon pentagon parallellagram pyramid
How about a nonagon which is a 9 sided polygon.
polygon
Yes, there is. For example, a box-letter arrow is a polygon. A stick-letter arrow is not, because it is not in 1 piece