# 10.8: Circumference

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**At Grade**Created by: CK-12Estimated7 minsto complete

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chord

A line segment whose endpoints are on a circle.Circumference

The circumference of a circle is the measure of the distance around the outside edge of a circle.diameter

A chord that passes through the center of the circle. The length of a diameter is two times the length of a radius.pi

(or ) The ratio of the circumference of a circle to its diameter.Congruent

Congruent figures are identical in size, shape and measure.Radius

The radius of a circle is the distance from the center of the circle to the edge of the circle.Regular Polygon

A regular polygon is a polygon with all sides the same length and all angles the same measure.### Image Attributions

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Description

This concept teaches students how to calculate the circumference of a circle.

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Date Created:

Jul 17, 2012
Last Modified:

Oct 06, 2016
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