# Radius or Diameter of a Circle Given Area

## r = sqrt(A/π); d = 2sqrt(A/π)

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.
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## Radius or Diameter of a Circle Given Area

by CK-12 //at grade
Learn to find the radius or diameter of a circle when you have been given the area.
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• Read

## Radius or Diameter of a Circle Given Area

by Christopher King //at grade
Find the radius or diameter of a circle given the area of the circle
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• Read

## Radius or Diameter of a Circle Given Area

by CK-12 //at grade
Learn to find the radius or diameter of a circle when you know the area.
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• PLIX

## How Tall is the Snowman?

by CK-12 //at grade
Radius or Diameter of a Circle Given Area Interactive
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• Real World Application

## Circles in the Cereal

by CK-12 //at grade
Discover the truth about crop circles.
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