https://www.tableau.com/zh-tw/research/publications/arcs-angles-or-areas-individual-data-encodings-pie-and-donut-charts
Arcs, Angles, or Areas: Individual Data Encodings in Pie and Donut Charts
pie and donutdata encodings
https://wordpress.org/support/plugin/pie-and-donut-chart/reviews/
[Pie and Donut charts] Reviews | WordPress.org
pie and donutchartsreviewswordpress