A nonagon has 9 edges.
Assuming that demination is meant to be dimension, the answer is a triangular prism.
Not any geometric figure.
A rectangular pyramid.
A tetrahedron.
The edges are the lines that form the geometric figure, such as the lines of a square. For instance, a triangle is made up of three edges, the length of the edges added together equals the perimeter.
a nonagon has 9 edges
There are no regular geometric figures with 9 edges and 10 faces.. I'm not even entirely sure there is an irregular geometric figure that would allow for such a combination- edge count and face count are usually identical... Maybe if you were describing some sort of conic section but I can't figure out what that might look like.
A square is a polygon because it is a closed geometric figure with line segments and no curved edges
A cube
A pyramid with a square base.
It is a triangular prism