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.
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
the degrees of a 102 sided shape is 18,000 degrees!
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
Providing that it is a regular 15 sided polygon then each interior angle will be 156 degrees
120
The interior angles of an 18 sided polygon add up to 2880 degrees
Exterior angle = 14.4 degrees Interior angle = 165.6 degrees
An interior angle of a 30-sided polygon can have any value between 0 and 360 degrees : with the possible exception of 180 degrees - which would make it a 29 sided polygon!
(n-2)*180 3420 degrees
2340 degrees
The exterior angle of a 7 sided shape add up to 360 degrees The interior angles of a 7 sided shape add up to 900 degrees