# 10.10: Area of a Circle

Difficulty Level: At Grade Created by: CK-12
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### Vocabulary Language: English Spanish

TermDefinition
chord A line segment whose endpoints are on 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 $\pi$) The ratio of the circumference of a circle to its diameter.

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Date Created:
Jul 17, 2012
Last Modified:
Oct 06, 2016
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MAT.GEO.840.L.2