# Venn Diagrams

This picture is an example of a 4-set Venn diagram.

*I notice *four main rectangles: red, blue, yellow, and grey.*I notice *that each region contains a unique combination of colors.*I wonder *how many regions there are.*I wonder *if there is a region that contains all four colors.*I wonder *if the diagram includes all possible combinations of the four colors.*I notice *that the diagram has symmetry.

*I notice *that this Venn diagram is made of rectangles rather than circles.*I wonder *if there are other ways to create a 4-set Venn diagram.*I wonder *if I could make a 4-set Venn Diagram using only circles.*I wonder *how many regions a 5-set Venn diagram would need to have.*I wonder *if it is possible to make a 5-set Venn diagram.*I wonder *if a 5-set Venn diagram can have symmetry.*I wonder *what is the best way to keep track of the regions so that I don't miss any.*I wonder *if there is a pattern to the number of regions that an *n*-set Venn diagram would need to have.*I wonder *if it is possible to make all *n-set* Venn diagrams (where *n *can be any counting number).

For an introduction to Venn Diagrams in general, look here at Purplemath. For a brief look at 4-set Venn diagrams, look here. For more detail, try the Mathematics Stack Exchange, a question and answer site for math at all levels!