Pie chart

In a pie chart, the arc length (and consequently, the central angle and the area) of each segment, is proportional to the quantity it represents. Together, the wedges create a full disk. A chart with one or more wedge separated from the rest of the disk is called an exploded pie chart.

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The following example chart is based on the results of the election for the European Parliament in 2004. The following table lists the number of seats allocated to each party group, along with the percentage of the total that they each make up. The values in the last column, is the central angle of each segment, found by multiplying the percentage by 360°.

Arc length: Determining the length of an irregular arc segment?also called rectification of a curve?was historically difficult. Although many methods were used for specific curves, the advent of calculus led to a general formula that provides closed-form solutions in some cases....

Central angle: A central angle is an angle whose vertex is the center of a circle, and whose sides pass through a pair of points on the circle, thereby subtending an arc between those two points whose angle is (by definition) equal to the central angle itself....

Area: This article explains the meaning of area as a physical quantity. The article area (geometry) is more mathematical....

Pie chart related Images and Photos (experimental)

Eye Chart	Beyblade - Chart	Corvette Chart	Cream Pie
Pie a la Mode	American Pie 2	American Pie 2	Pie in the Sky
American Pie	American Pie DVD (Widescreen)	American Pie DVD (Widescreen)	American Pie DVD (Widescreen)