Three Overlapping Circles - making a Venn Diagram

[Acorn]

You never said we could not use rectangles. It is my math for the math-challenged solution.

Gary, my bad. I thought the intent was clear in

Again, the construction is to be as simple and as accurate as the Xara Desktop application allows.
This time, any of the circles can be cloned for use in your construction.

There was an implicit back-reference to the other Challenges that was implicit, not explicit.

Acorn