A 2D shape with forty sides is known as a tentracontagon.
Its called a HEPTAGON
As a 2D polygon shape it is an 8 sided octagon.
A nine sided two dimensional shape would be called a nonagon. Nona is a common prefix meaning nine of something.
Any 4 sided 2D shape
Hendecagon
10 sided 2D shape is called a decagon 20 sided 2D shape is called a icosagon 30 sided 2D shape is a swimming pool 40 sided 2D shape is unknown 50 sided 2D shape is unknown 60 sided 2d shape is unknown 70 sided 2d shape is unknown 80 sided 2d shape is unknown 90 sided 2d shape is unknown 100 sided 2d shape is unknown 110 sided 2d shape is unknown 111 sided 2d shape is unknown 120 sided 2d shape is unknown 130 sided 2d shape is unknown
A 2d nine sided shape is called a nonagon.
An endecagon
A two-dimensional eleven-sided figure is called a hendecagon.
A 2D shape with forty sides is known as a tentracontagon.
A 14 sided polygon is called a tetrakaidecagon.
Its called a HEPTAGON
heptadecagon is a 17 sided 2d shape
n
enneadecagon
nonanonacontanonactanonaliagon