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2. Pie chart - Wikipedia

   en.wikipedia.org/wiki/Pie_chart

   Square charts, also called waffle charts, are a form of pie charts that use squares instead of circles to represent percentages. Similar to basic circular pie charts, square pie charts take each percentage out of a total 100%. They are often 10 by 10 grids, where each cell represents 1%.

3. Template:Pie chart - Wikipedia

   en.wikipedia.org/wiki/Template:Pie_chart

   Pie slices are drawn in clockwise order in a counterclockwise direction. These pie slices are positioned: Inside a square element of (2 * radius)x(2 * radius) pixels; with border-radius: radiuspx for a circular shape; with a white (or other specified color) background visible in the empty space that occurs if the "other" slice is present

4. William Playfair - Wikipedia

   en.wikipedia.org/wiki/William_Playfair

   William Playfair (22 September 1759 – 11 February 1823) was a Scottish engineer and political economist.The founder of graphical methods of statistics, [1] Playfair invented several types of diagrams: in 1786 he introduced the line, area and bar chart of economic data, and in 1801 he published what were likely the first pie chart and circle graph, used to show part-whole relations. [2]

5. File:Mammal species pie chart.svg - Wikipedia

   en.wikipedia.org/wiki/File:Mammal_species_pie...

   Such very simple pie charts can be drawn with a Wikimedia tool. Licensing This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication .

6. Area chart - Wikipedia

   en.wikipedia.org/wiki/Area_chart

   William Playfair is usually credited with inventing the area charts as well as the line, bar, and pie charts.His book The Commercial and Political Atlas, published in 1786, contained a number of time-series graphs, including Interest of the National Debt from the Revolution and Chart of all the Imports and Exports to and from England from the Year 1700 to 1782 that are often described as the ...

7. Wikipedia:Graphs and charts - Wikipedia

   en.wikipedia.org/wiki/Wikipedia:Graphs_and_charts

   Livegap Charts creates line, bar, spider, polar-area and pie charts, and can export them as images without needing to download any tools. Veusz is a free scientific graphing tool that can produce 2D and 3D plots. Users can use it as a module in Python. GeoGebra is open-source graphing calculator and is freely available for non-commercial users.