The equation to find the size of the interior angle of an n sided shape is (n-2)180/n
For a 120 sided shape, you need to plug n=120 into this equation.
(120-2)180/120
=118x180/120
=177
Thus a 120 sided shape does have an angle of 177 degrees, and the statement in the question is true.
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Each interior angle of a regular 24 sided polygon is 165 degrees
If it is a regular 8 sided octagon then each interior angle is 135 degrees
a seven sided shapes interior = about 128.5 degrees
120
The interior angles of an 18 sided polygon add up to 2880 degrees