No it is not: any shape with four or more sides which are connected pair-wise is not rigid.
No, a nonagon is a 9-sided shape.
nonagon A nonagon is a nine faced shape.
a nonagon
It is a nonagon
A nonagon is a 2D shape and there is not a 3D equivalent shape.
nonagon
Nonagon
A nonagon
nonagon
polygon or nonagon
Nonagon.
Nonagon.