Sektordiagramm
Sektordiagramm, in English commonly known as a pie chart, is a circular diagram used to illustrate numerical proportions in a dataset. It consists of sectors (wedges) of a circle, each sector representing a category's share of a total.
The central angle of each sector is proportional to the category's percentage of the whole: a full
Variants include the donut chart, which leaves a blank center, and exploded pie charts, where sectors are
The diagram is most effective when the number of categories is small (roughly up to five to
History and usage: circle graphs were popularized in the 19th century; William Playfair introduced circle graphs