Symmetric Diagrams Venn for small n

On this page we show many examples of symmetric Venn diagrams for specific values of $n$. For $n = 2$, there is only one Venn diagram and it can be drawn to be polar symmetric. For $n = 3$, there are two symmetric diagrams. 

Click on the image.

The classic three circle diagram is monotone, simple, and has polar symmetry. Diagram #3.1 of Class 1 in the list of all Venn diagrams for $n=3$ is also a polar symmetric diagram, but it is not simple, nor is it rigid.