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Exterior angle = 360/120 = 3 degrees.

So interior angle = 180-3 = 177 degrees.

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Q: What is the interior angle of a polygon that has 120 sides?
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How many sides does a polygon with an interior angle measure of 120 degrees have?

A regular polygon having an interior angle of 120 degrees will have 6 sides and is called an hexagon.


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