I don't know the exact amount when it starts, but I just tried it with 1 trillion sides and each angle was 180. So we know it starts between 1 billion and 1 trillion sides.
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Each interior angle will measure 156 degrees
Each interior angle will measure 162 degrees
A regular polygon having an interior angle of 120 degrees will have 6 sides and is called an hexagon.
24 sides
A regular polygon with each interior angle measuring 120 degrees is a hexagon.