Answer:
1120°
Step-by-step explanation:
Use the sum of interior angles formula:
[tex]180(n-2)[/tex]
Where n is the number of sides.
In a nonagon, there are 9 sides, substitute 9 for n:
[tex]180(9-2)\\180(7)\\1260[/tex]
Since our nonagon is a regular nonagon, all 9 angles measure the same, so each angle measures:
[tex]\frac{1260}{9} =140[/tex]
Subtract 140 from 1260:
[tex]1260-140=1120[/tex]
