360/(180-12)=won't work because the smallest is 60 to work because that is a triangle.
If you meant 120 then that would be 6.
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If it is a regular polygon then it will have 10 sides
A polygon with 30 sides has a total interior angle measurement of 5040o, with each interior angle measuring 168o.
The polygon would have 10 sides.
A regular polygon having an interior angle of 120 degrees will have 6 sides and is called an hexagon.
51 sides