Diagrams of Concentric Ring Patterns α and β - Geometric Illustration #2052865 (License: Personal Use)

Diagram α shows an annulus divided into evenly spaced radial sectors and concentric bands, forming rectangular-like cells. Diagram β depicts a more complex subdivision where radial lines curve outward and intersect concentric circles to create quadrilateral cells, resembling a polar grid transformation. Both are hand-drawn schematic representations common in 19th- and early 20th-century mathematical texts.

This image is typically used in academic articles, educational resources, or historical math archives to explain coordinate transformations, annular partitions, or topological mappings; user intent includes learning or referencing classical geometric visualization techniques.