A 2d shape with uncountable lines of symmetry is a circle.
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This varies according to the polygon. A polygon is any 2D closed shape with three or more straight sides. Therefore, a polygon such as a square will have four lines of symmetry, but an irregular hexagon may have several or none. Even a triangle can have between zero and three lines of symmetry, depending on the type of triangle it is.
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a regular hexagon
A parallelogram
It is an hexagon which has 6 sides
A circle, since it has an infinite number of lines of symmetry
2d
An irregular quadrilateral.
Such a 2D shape is a hexagon, a six sided figure.
A closed wiggly line. or many irregular polygons such as scalene triangle, ordinary quadrilateral, trapezium (if not isosceles), etc.