A nonagon is a 2-dimensional figure and so has only one face.
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There are 10 sides : 9 sides and the nonagonal base.
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Nine faces. That's because the "hedron" part is for a polyhedron (3D shape). Then non is nine (think nonagon).
It is called a Nonagon.
Nonagon
Oh, dude, a nonagon has 9 faces, 27 edges, and 18 vertices. It's like a fancy way of saying a shape with nine sides. So, if you ever need to impress someone with your geometry knowledge at a party, there you go!
A nonagon (9 sides) for example.
Triangle Pentagon Septagon Nonagon Etc
A Nonagon has 9 sides
A Nonagon has 36 diagonals