Icosikaihenagon
Icosahedron is the shape, but it's just called 20 sided if you want to buy one.
hendaciahedron
The name of a 21 sided polygon is Icosihenagon.
A one sided shape
A thirty-one sided polygon would be called a triacontakaihenagon.
An 80 sided shape is called a Octacontagon.
I don't believe there is a name for the first one, but a 14-sided shape is called a tetradecagon.
A semicircle is one possible answer.
A one-million-sided polygon.
it is called a henagon is a one sided shape
The name of a 51 sided polygon is Pentaconhenagon. The name of a 52 sided polygon is Pentacondigon. The name of a 53 sided polygon is Pentacontrigon. The name of a 54 sided polygon is Pentacontetragon. The name of a 55 sided polygon is Pentaconpentagon. The name of a 56 sided polygon is Pentaconheptagon. The name of a 57 sided polygon is Pentaconhexagon. The name of a 58 sided polygon is Pentaconoctagon. The name of a 59 sided polygon is Pentaconenneagon.
that is seven hundred and twenty. Because it is just only one times table away from nine...