Radial bars, progress rings or a single ring: which layout when?
Radial Bar > Layout offers three readings of the same fields. Radial bars (shared maximum) compare categories with each other: headcount by department, sorted, on one round maximum with a circular value grid, so the arc length is proportional to the value. Progress rings (each to its target) answer "how far along is each one?": every ring runs to its own target, so a plant at 66 % of a $10.4M goal and a plant at 55 % of a $5.3M goal read on the same scale. Single ring (KPI) is one big number on one ring for a KPI card. Auto picks rings when a target is set and bars when not.
On a ring the outer bars are longer than the inner ones for the same value, which is why the labels carry the numbers and the footnote says "Outer rings are longer for the same value: compare by the labels." Sorting and Other keeps the eight largest by default and folds the rest into Other; with more than twelve rings an edit-mode hint suggests keeping eight or fewer, because rings get hard to read.
