# Diameter or Radius of a Circle Given Circumference

## C = πd; C = 2πr

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.
• 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

## Circles: Radius, Diameter and Circumference

by CK-12 //basic
Introduces the properties and components of circles.
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