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The sum of the interior angles of a polygon with n sides is (n-2)*180 degrees.

So, the sum of the interior angles of an 18-gon is 16*180 = 2880 degrees.

Subject to this sum, each particular angle can range from 0 to 360 (not inclusive) degrees. If you assume that all the angles of the 18-gon are equal, then you can say that each angle is 2880/18 = 160 degrees. However, there is absolutely no reason to support such an assumption.

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Q: How do you find the interior angles of a 18-gon?
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