It is polygon but this type of shape is a nonagon.
A nonagon is a 2 dimensional shape that has nine sides. A polygon on the other side refers to a plane that is 2D and has three straight sides.
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
A shape with 9 sides, is a nonagon.
A shape with 9 unequal sides would be called an irregular nonagon or an irregular enneagon.
An octagonally-based pyramid would have 9 sides
A nonagon has 9 sides.
The 9-side shape
A 2D shape with 9 sides is called a Nonagon.
A shape with 9 sides is a nonagon. A decagon has 10 sides.
7 sides heptagon 9 sides nonagon
A shape with nine sides is called a nonagon.
It's a shape with 9 sides.