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The earliest known use of a pie chart can be traced back to the 17th century, when Scottish engineer William Playfair used circular diagrams to show the relative sizes of different countries economies. Over the years, the use of pie charts has evolved and become more widespread.
To read a pie chart, you need to compare the sizes of the slices and the angles at which they are drawn. In contrast, bar graphs are read by comparing the lengths of the bars, which can be easier and more intuitive for some people.