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## Circle

en.wikipedia.org/wiki/Circle

A circle is a simple closed shape in Euclidean geometry. It is the set of all points in a plane that ... by two concentric circles. Arc: any connected part of the circle.

## Parts of a circle - Pictorial index - Math Open Reference

www.mathopenref.com/pictorialindex.html

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

## Labeling parts of a circle | Area and circumference of circles | Khan ...

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

## The Circle and Parts of a Circle - eMathZone

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

Parts of a Circle: The radius of the circle is a straight line drawn from the center to the boundary line or the circumference. The plural of the word radius is radii.

## Cool math .com - The Geometry of Circles - Radius, Diameter ...

www.coolmath.com/reference/circles-geometry

Definitions and formulas for the radius of a circle, the diameter of a circle, the circumference (perimeter) of a circle, the area of a circle, the chord of a circle, arc  ...

## Circles: diameter, chord, radius, arc, tangent (with examples, videos ...

www.onlinemathlearning.com/diameter-of-circle.html

Parts of a Circle - Diameter, Chord, Radius, Arc, Tangent, Intersecting Circles, Internal and External Tangents with examples and videos.

## Area of Sectors and Segments of Circles - RegentsPrep

www.regentsprep.org/regents/math/geometry/gp16/circlesectors.htm

(Sectors are similar to "pizza pie slices" of a circle.) Semi-circle (half of circle = half of area). Quarter-Circle (1/4 of circle = 1/4 of area). Any Sector (fractional part  ...

## IXL - Parts of a circle (7th grade math practice)

Fun math practice! Improve your skills with free problems in 'Parts of a circle' and thousands of other practice lessons.

Nov 11, 2013 ... This video quickly identifies and defines the parts of a circle.
Jul 8, 2013 ... CTC Math http://ctcmath.com/ Join with more than 217000 students now confident in math because finally they can do it! Learn at your pace, not ...

### Geometry and the Circle - Math Goodies

www.mathgoodies.com

A circle is an important shape in the field of geometry. Let's look at the definition of a circle and its parts. We will also examine the relationship between the circle ...

### Definitions of Parts of Circles - AlgebraLAB

www.algebralab.org

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 ...

### Circle - Math is Fun

www.mathsisfun.com

circle. A circle is easy to make: Draw a curve that is "radius" away from a central point. And so: ... a Tangent. And a part of the circumference is called an Arc.