For a nine-sided enclosed object, a nonagaon, the equation would be 360 degrees divided by 9. That will provide you with the answer.
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It is 360/9 = 40 degrees.
If you mean each exterior angle of a regular 9 sided nonagon then it is 360/9 = 40 degrees
Each interior angle is 140 degrees. Each exterior angle is 220 degrees.
360/9 = 40 degrees
Each exterior angle is: 360/9 = 40 degrees