



 
Hi Avaline. Let's examine a diagram first:
Now let's add a few dimensional lines to help analyze this figure: As you can see, the radius of the large circle is R and the radius of one shaded (blue) circle is r. So the ratio of the bluetoyellow (shadedtounshaded) areas is:
This doesn't finish the problem, because we have two variables in there. Can you examine the lines I drew and come up with a relationship between r and R? Then you can substitute this in and the last variable will cancel out leaving you with a simple ratio. Hope this helps,
 


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