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en.wikipedia.org/wiki/Circle

A circle is a simple closed shape. It is the set of all points in a plane that are at a given distance ... two concentric circles. Arc: any connected part of the circle.

en.wikipedia.org/wiki/Circular_segment

In geometry, a circular segment (symbol: ⌓) is a region of a circle which is "cut off" from the rest ... The angle thus inscribed is θ/2 and is part of a right triangle whose hypotenuse is the diameter. This is also useful in deriving other inverse ...

www.ck12.org/geometry/Parts-of-Circles/lesson/Parts-of-Circles-BSC-GEOM

Feb 24, 2012 ... Circles. A circle is the set of all points in the plane that are the same distance away from a specific point, called the center. The center of the ...

Radius, diameter, center, and circumference--all are parts of a circle. Let's go through each and understand how they are defined.

www.mathopenref.com/pictorialindex.html

A pictorial index to the parts of a circle. A diagram with links to full definitions.

www.emathzone.com/tutorials/geometry/the-circle-and-parts-of-a-circle.html

The Circle and Parts of a Circle. The Circle. A circle is a plane curve consisting of all points that have the same distance from a fixed point, called the center.

www.mathsisfun.com/geometry/circle.html

radius diameter circumference: circle/diameter = pi = 3.14159... The Radius is the distance from ... And a part of the circumference is called an Arc. circle slices ...

www.brightstorm.com/math/geometry/geometry-building-blocks/parts-of-a-circle

A chord is a line segment whose endpoints are on a circle. A diameter is a chord that passes through the center of a circle. Another one of the parts of a circle is ...

www.algebralab.org/lessons/lesson.aspx?file=Geometry_CircleDefinitions.xml

Introduction: A circle is all points equidistant from one point called the center of the circle. Segments drawn near and through the circle create other geometrical ...