The core principle involves mapping categorical frequency distributions onto a circular geometric domain where sector angles correspond strictly to proportional magnitudes relative to a total sum of unity. This mechanism defines the visual encoding rule wherein angular displacement serves as the sole metric for value representation, establishing an isomorphism between statistical proportions and spatial wedge areas. The concept operates within the subfield of quantitative visualization theory, specifically addressing the mathematical constraints required to accurately depict compositional data without introducing cognitive distortion regarding part-to-whole relationships.
Prerequisite chain context: requires Bar Chart Visualization using Software Tools like Data.net.