# Circle Circumference

## C = πd; C = 2πr

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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.
• Video

## Circumference of a Circle

by CK-12 //basic
Learn how to find the circumference of a circle.
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• Video

## Determine the Circumference of a Circle

by CK-12 //basic
Provides two examples of determining the circumference of a circle. One example looks at when the length of the diameter is given, and the other looks at when the length of the radius is given.
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• Video

## Circumference - Overview

by CK-12 //basic
Overview
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• Video

## Circumference - Example 1

by CK-12 //basic
Find the circumference given radius or diameter
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## Circumference - Example 2

by CK-12 //basic
Find radius or diameter given circumference
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## Circumference - Example 3

by CK-12 //basic
Perimeter of circular shapes
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