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A pie chart (or a circle chart) is a circular statistical graphic which is divided into slices to illustrate numerical proportion. ... Like conventional pie charts, ...
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]
The number π (/ p aɪ /; spelled out as "pi") is a mathematical constant that is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159.It appears in many formulae across mathematics and physics, and some of these formulae are commonly used for defining π, to avoid relying on the definition of the length of a curve.
The most common technique, first appearing in the 1850s, is to start with a proportional circle sized according to some total amount, and turn it into a pie chart to visualize the relative composition of the total, such as the percentage of a total population belonging to various ethnic groups.
Mathematical "graph paper" is formed by imagining a 1×1 square centered around each cell (x, y), where x and y are integers between − r and r. Squares whose center resides inside or exactly on the border of the circle can then be counted by testing whether, for each cell ( x , y ) ,
This allows only the part of each slice that is inside the circle to be visible on the page. Most of the code in {{ Pie chart/slice }} is divided into five sections, the first four corresponding to quadrants of the circle and the last to cleanly cover the case in which one slice occupies 100% of the chart.
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A pie chart showing the composition of the 38th Parliament of Canada. A chart (sometimes known as a graph) is a graphical representation for data visualization, in which "the data is represented by symbols, such as bars in a bar chart, lines in a line chart, or slices in a pie chart". [1]