# Circle Graph

This human anatomy diagram with labels depicts and explains the details and or parts of the Circle Graph. Human anatomy diagrams and charts show internal organs, body systems, cells, conditions, sickness and symptoms information and/or tips to ensure one lives in good health.

In graph theory, a circle graph is the intersection graph of a set of chords of a circle. That is, it is an undirected graph whose vertices can be associated with chords of a circle such that two vertices are adjacent if and only if the corresponding chords cross each other.

In graph theory, a circle graph is the intersection graph of a set of chords of a circle. That is, it is an undirected graph whose vertices can be associated with chords of a circle such that two vertices are adjacent if and only if the corresponding chords cross each other.

The chords forming the 220-vertex 5-chromatic triangle-free circle graph of Ageev (1996), drawn as an arrangement of lines in the hyperbolic plane. The chromatic number of a circle graph is the minimum number of colors that can be used to color its chords so that no two crossing chords have the same color.