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160
The interior angle of an octdecagon, an 18 sided regular polygon, is 160o.
A regular polygon having an interior angle measure of 168o has 30 sides and is called a triacontagon.
If each interior angle is 178 degrees then the regular polygon will have 180 sides.
There is no regular polygon with an interior angle of 20o. If the interior angle is 120o then there are six sides and the sum of the angles is 720o.