VennWorkSheet

Assistant for working with 2- and 3-circle Venn diagrams. Also has a puzzle mode.

Top button toggles between 2- and 3-circle mode. If you're in 3-circle mode and exactly two of the circles are shaded, those are the ones that are brought over to 2-circle mode.

Second button toggles between worksheet and puzzle modes.

Mouse is either in size or shading mode; the current mode is indicated in the upper right. Change mode using the 2nd to bottom button.

Bottom button determines union or intersection mode. When you click on the point of intersection of two or three circles you either get the union or the intersection of the circles.

Union button forms the union (in purple) of the selected blue and pink regions.

Intersection button forms the intersection (in purple) of the selected blue and pink regions.

Yin-Yang button forms the complement of the selected region.

Push and Pop and for the stack that remembers purple selections.

"Size form Sum" button calculates the size of the shaded blue regions.

"Size from Diff" button calculates the size of the purple region contained inside a known blue region.