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# 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.
• Video

## Determine the Area of a Circle

by CK-12 //basic
Provides an example of how to determine the area of a circle when given the diameter.
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• Video

## Mixed Up Area and Perimeter of a Circle - Example 1

by CK-12 //basic
Find circumference given area
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• Video

## Area of a Circle: Candy Example

by CK-12 //basic
Learn how to find the area of a circle using an example with candy.
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• Video

## Mixed Up Area and Perimeter of a Circle - Example 2

by CK-12 //basic
Word Problems
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