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# Circumference

## Pi times the diameter or the distance around the circle.

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.
• Read

## Circumference

by CK-12 //at grade
This concept teaches students how to calculate the circumference of a circle.
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• PLIX

## Circumference: Ancient Stonehenge Math Mysteries

by CK-12 //at grade
Circumference Interactive
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• PLIX

## Decode the Circumference Formula

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Circumference Interactive
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• PLIX

## Definition of Pi

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Circumference Interactive
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• PLIX

## Circling a Circle

by CK-12 //at grade
Circumference Interactive
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• Video

## Circumference Principles

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

## Circumference Examples

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

## Circumference Discussion Questions

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

## A Roundabout Way Home

by CK-12 //at grade
Find out why roundabouts are safer than traditional intersections.
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• Real World Application

## Getting in Gear!

by CK-12 //at grade
Discover how gears work and how circumferences come into play.
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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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