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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. In a pie chart, the arc length of each slice (and consequently its central angle and area ) is proportional to the quantity it represents.
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Ptolemy used a circle of diameter 120, and gave chord lengths accurate to two sexagesimal (base sixty) digits after the integer part. [2] The chord function is defined geometrically as shown in the picture. The chord of an angle is the length of the chord between two points on a unit circle separated by that central angle.
English: Gray, blue, red, green, light green, black graph papers with 1 cm–0.5 cm–1 mm grids (page size: A4) in printable PDF format. Date 25 July 2013, 18:04:17
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The circle graph <math>C_4</math>. Based on Image:Complete bipartite graph K3,3.svg by David Benbennick. {{PD-self}}Category:Graph theory: 15:52, 2 February 2007: 1,062 × 805 (715 bytes) Illes: The circle graph <math>C_4</math>. Based on Image:Complete bipartite graph K3,3.svg by David Benbennick. {{PD-self}}Category:Graph theory: 15:47, 2 ...