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# Area of a Circle

## Pi times the radius squared.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Area of a Circle

by CK-12 //at grade
This concept teaches students how to calculate the area of a circle.
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## Area of a Circle

by CK-12 //at grade
Learn to find areas of circles given the radius or the diameter.
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## Area of Circles

by CK-12 //at grade
Learn to calculate the area of circles and the area of sectors of circles.
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## Area of a Circle

by CK-12 //at grade
Learn how to find the area of a circle.
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## Area of a Circle

by CK-12 //at grade
Learn to find areas of circles given the radius or the diameter.
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• PLIX

## Examing Circles: Area of a Circle

by CK-12 //at grade
Area of a Circle Interactive
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• PLIX

## Area of a Circle: Hula Hoop Radius

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Area of a Circle Interactive
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• PLIX

## Area of a Circle: Campsite

by CK-12 //at grade
Area of a Circle Interactive
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• Video

## Area of a Circle Principles

by CK-12 //at grade
This video gives more detail about the mathematical principles presented in Area of a Circle.
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• Video

## Area of a Circle Examples

by CK-12 //at grade
This video shows how to work step-by-step through one or more of the examples in Area of a Circle.
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• Critical Thinking

## Area of a Circle Discussion Questions

by CK-12 //at grade
A list of student-submitted discussion questions for Area of a Circle.
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• Real World Application

## Ringside Seats

by CK-12 //at grade
Discover why sports venues are circular.
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• Study Guide

## Circumference and Arc Length Study Guide

by CK-12 //at grade
An overview of the formulas for circumference, arc length, sectors, and segments of circles is presented in this study guide.
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