Well, darling, a 3D shape with 9 sides is called a nonagon. It's like a polygon, but with an extra dimension to spice things up. So, next time you see a nonagon, give it a little wink and strut on by.
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Nonagons.
Nonagons.
3 - triangle 4 - quadrilateral 5 - pentagon 6 - hexagon 7 - heptagon / septagon 8 - octagon 9 - nonagon 10 - decagon 11 - hendecagon 12 - dodecagon
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a shape with nine sides is called nonagon