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# 10.10: Area of a Circle

Difficulty Level: At Grade Created by: CK-12
Estimated15 minsto complete
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Practice Area of a Circle
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Estimated15 minsto complete
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### Vocabulary Language: English Spanish

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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