It's impossible to tell, unless it's a regular nonagon. All we're sure of is
that all nine of them total up to 360 degrees.
If it happens to be a regular nonagon, then each one is 40 degrees.
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It is a 9 sided nonagon and its 9 interior angles add up to 1260 degrees
The measure of one exterior angle of a regular 18-gon is 20°. The sum of all exterior angles of a regular polygon is always 360° so the measure of each exterior angle can be calculated by dividing 360° by the number of sides. In this case that would be: 360° 18 = 20°Therefore the measure of one exterior angle of a regular 18-gon is 20°.
A nine sided shape that is called a regular nonagon.
An exterior angle is 360/7 = 51.4286 degrees. So interior angle is 180 - exterior angle = 128.57 degrees (approx).
Consider a right triangle. One of the exterior angles 90 degrees.