It's quite acceptable to call them a 57-agon or a 99-agon but what's more important is knowing how to work out their properties.
Polygons.
namesand pictures of quadrilaterals and other polygons
113
They are called polygons.
If all the sides are straight lines, then they are known as polygons.
51 100 sided of palygon
Not all polygons have names. Go to the link below for the names of some of them
It is quite acceptable to call them an 11-agon to a 100-agon but what is more important is knowing how to work out their properties.
Polygons.
namesand pictures of quadrilaterals and other polygons
yes they all have special names.
113
polygons
polygons, I believe.
Squares and polygons. DumbA**
There are infinitely many polygons so it would be impossible to name them all. For the names of those with a fewer sides see the related link.
Triangle, rectangle, pentagon, hexagon, octagon. Though, there are much more names of polygons.