I am using three points to create a Venn Diagram with the Excel Bubble Chart.

At the moment, the bubbles have no FILL; if I use a different colour FILL in
each circle, how can I use the TRANSPARANCY so that I might be able to see
the common, and triple overlapping area?

Is there any relationship between the scale of the grid numbers (x,y), and
the radius number (r)? (There doesn't appear to be!)

What does the "scale the bubble size nnn% to the default" mean?

Thanks in anticipation

Bill Hall