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# 9.17: Area of a Circle

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

chord

A line segment whose endpoints are on a circle.

circle

The set of all points that are the same distance away from a specific point, called the center.

circumference

The distance around 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.

The distance from the center to the outer rim of a circle.

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Difficulty Level:
Basic
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## Concept Nodes:

8 , 9 , 10
Date Created:
Feb 24, 2012
Aug 25, 2016
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MAT.GEO.840.L.1
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