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Their circumferences are in direct proportion to their radii.

Their areas are in direct proportion to the square of their radii.

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Q: What is the relationship between two circles?
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Related questions

If there are two circles and the small one has diameter of 20 what is the radius of the big circle?

You need some more information about any of the circles, or about the relationship between the two circles, to answer this question.


What is the relationship between circles and triangles?

Circles and triangles are both geometric shapes, and their areas can be found using certain formulas.


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When are two circles concentric?

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