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2. Circle graph - Wikipedia

   en.wikipedia.org/wiki/Circle_graph

   A graph is a circle graph if and only if it is the overlap graph of a set of intervals on a line. This is a graph in which the vertices correspond to the intervals, and two vertices are connected by an edge if the two intervals overlap, with neither containing the other. The intersection graph of a set of intervals on a line is called the ...

3. Pie chart - Wikipedia

   en.wikipedia.org/wiki/Pie_chart

   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. While it is named for its resemblance to a pie which has been sliced, there ...

4. Chord (geometry) - Wikipedia

   en.wikipedia.org/wiki/Chord_(geometry)

   Chord (geometry) A chord (from the Latin chorda, meaning "bowstring") of a circle is a straight line segment whose endpoints both lie on a circular arc. If a chord were to be extended infinitely on both directions into a line, the object is a secant line. The perpendicular line passing through the chord's midpoint is called sagitta (Latin for ...

5. Circle - Wikipedia

   en.wikipedia.org/wiki/Circle

   A circle is a shape consisting of all points in a plane that are at a given distance from a given point, the centre. The distance between any point of the circle and the centre is called the radius. The length of a line segment connecting two points on the circle and passing through the centre is called the diameter.

6. Chord diagram (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Chord_diagram_(mathematics)

   Chord diagram (mathematics) In mathematics, a chord diagram consists of a cyclic order on a set of objects, together with a one-to-one pairing ( perfect matching) of those objects. Chord diagrams are conventionally visualized by arranging the objects in their order around a circle, and drawing the pairs of the matching as chords of the circle.

7. Unit circle - Wikipedia

   en.wikipedia.org/wiki/Unit_circle

   Since C = 2πr, the circumference of a unit circle is 2π. In mathematics, a unit circle is a circle of unit radius—that is, a radius of 1. [1] Frequently, especially in trigonometry, the unit circle is the circle of radius 1 centered at the origin (0, 0) in the Cartesian coordinate system in the Euclidean plane.

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   mail.aol.com

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9. Circular-arc graph - Wikipedia

   en.wikipedia.org/wiki/Circular-arc_graph

   In graph theory, a circular-arc graph is the intersection graph of a set of arcs on the circle. It has one vertex for each arc in the set, and an edge between every pair of vertices corresponding to arcs that intersect. Formally, let. be a set of arcs. Then the corresponding circular-arc graph is G = (V, E) where. and.