A 17-gon
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The name for a 57 sided shape is derived by combining the name for a 50 sided shape with the name for a 7 sided shape. A 57 sided shape is called a pentacontaheptagon.
A 999 sided shape is simply known as a 999 sided shape.
The formula for finding the interior angles of a shape with n sides is ((n-2)*180)/n. Thus, we have ((17-2)*180)/17 = (15*180)/17 = 2700/17 = 158.824 degrees.
An 11 sided shape is an Eptogon
icosikaidigon is a 22 sided shape