A regular polygon with 9 sides is a nonagon.
The expression for the measure of its interior angle is: [tex]\frac{(9 - 2) \times 180}{9}[/tex]
We have:
[tex]n = 9[/tex] ---- sides of the polygon
The interior angle of the polygon is calculated using:
[tex]\theta = \frac{(n - 2) \times 180}{n}[/tex]
Substitute 9 for n
[tex]\theta = \frac{(9 - 2) \times 180}{9}[/tex]
Hence, the correct expression is: [tex]\frac{(9 - 2) \times 180}{9}[/tex]
Read more about regular polygons at:
https://brainly.com/question/15941789
