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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.
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.
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.
A circle bounds a region of the plane called a disc. The circle has been known since before the beginning of recorded history. Natural circles are common, such as the full moon or a slice of round fruit. The circle is the basis for the wheel, which, with related inventions such as gears, makes much of modern
This work has been released into the public domain by its author, Lyonsam at English Wikipedia.This applies worldwide. In some countries this may not be legally possible; if so:
Formally, a biased graph Ω is a pair (G, B) where B is a linear class of circles; this by definition is a class of circles that satisfies the theta-graph property mentioned above. A subgraph or edge set whose circles are all in B (and which contains no half-edges ) is called balanced .
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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 ...