# 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.

## Circumference of Circles

Learn to find the diameter, radius and circumference of circles.
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## Diameter or Radius of a Circle Given Circumference

Learn to find the diameter and radius of a circle when you are given the circumference.
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## Diameter or Radius of a Circle Given Circumference

Learn to find the diameter or radius of a circle given the circumference.
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• PLIX

## Diameter or Radius of a Circle Given Circumference

Diameter or Radius of a Circle Given Circumference Interactive
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• 2
• Real World Application

## Watering Rounds

Discover the geometry behind center-pivot irrigation, a technique farmers use to water crops.
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• Real World Application