nonagon, also called enneagon. See: http://en.wikipedia.org/wiki/Enneagon
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a shape with nine sides is called nonagon
I assume you want the name of each shape, not just the generic polygon which refers to any multi-sided shape.5 sides - pentagon6 sides - hexagon7 sides - heptagon8 sides - octagon9 sides - nonagon10 sides - decagon
polegon
dont no!
It is polygon but this type of shape is a nonagon.