If the question required that the lines were straight, then they would be polygons, but since the question does not, there is nothing that can be said about the figures.
A polygon.
A polygon.
triangel
Polygon.
a polygon
A polygon.
polygon
A polygon, but only if all the line segments are coplanar.
polygon
polygon
triangle
polygon
A triangle.
That would be a polygon.
A irregular is a closed plane figure formed by three or more line segments.
A circle is not formed from line segments.
If they are straight lines then it is a polygon.