The number of sides of an n-sided polygon is also the number of angles of that polygon. Nonagons have 9 sides, so 9 angles.
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A nonagon has 9 angels ;)
I think you mean Nonagon -- a nunagon does not exist. A Nonagon is a 9 sided shape.
The smallest number of triangles that you could divide a nonagon into is seven.
9-2 = 7 triangles
The internal angles of a regular nonagon are 140o, so the exterior angles must be 220o (360o-140o).