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.
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
135 Each interior angle of a regular octagon measures 135 degrees.
180
135
1440 degrees
1260 degrees
1440 degrees
Each exterior angle measures 24 degrees. Each interior angle measures 156 degrees
Each interior angle measures 135 degrees Each exterior angle measures 45 degrees
Each interior angle measures 150 degrees Each exterior angle measures 30 degrees
Each exterior angle measures 15 degrees Each interior angle measures 165 degrees
Each exterior angle measures 72 degrees
Each internal angle measures 108 degrees