it is normally all obtuse.
* * * * *
The sum of the interior angles of an n-gon is (n-2)*180 degrees.
Since n = 18, the sum is 16*180 degrees.
So each angle is 16*180/18 = 160 degrees.
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Each exterior angle measures 10 degrees Each interior angle measures 170 degrees
Each exterior angle measures 11.5 degrees. Each interior angle measures 168.75 degrees
72 degrees
Each interior angle measures 135 degrees
Each exterior angle measures 36 degrees