Who drew circles to show how numbers can be organized?

Answer 1

The mathematician who famously used circles to illustrate how numbers can be organized was John Venn. He developed Venn diagrams in the 1880s, which visually represent the relationships between different sets. These diagrams use overlapping circles to demonstrate how various groups can share common elements or be distinct from one another. Venn's work has had a lasting impact on mathematics, logic, and statistics.