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English: A 220-vertex triangle-free circle graph requiring five colors, the maximum of any triangle-free circle graph, as described by A. A. Ageev, A triangle-free circle graph with chromatic number 5, Discrete Math. 152 (1996), 295–298.
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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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 February 2007: 1,062 × 805 (715 bytes) Illes: The circle graph <math>C_5</math>. Based on Image:Complete bipartite graph K3,3.svg by David Benbennick. {{PD-self}}Category:Graph theory: 15:46, 2 ...
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A circle with five chords and the corresponding circle graph. In graph theory, a circle graph is the intersection graph of a chord diagram.That is, it is an undirected graph whose vertices can be associated with a finite system of chords of a circle such that two vertices are adjacent if and only if the corresponding chords cross each other.