Question

What is a $120$ sided shape called?

Answer 1

Name of 120 sided polygon:

A $120$-sided polygon is called a Dodecacontagon or Hecatonicosagon.

The formula of the sum of the interior angle of a polygon is $\left(n-2\right)\mathbf{\times }\mathbf{180}\mathbf{°}$.

The sum of the interior angle of a polygon with $120$ side is $\left(120-2\right)\times 180°=21240°$.

The measure of one interior angle in a regular Dodecacontagon is $=\frac{21240°}{120}=177°$.

Hence,120 sided shape is called as Dodecacontagon.