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Two concentric circles with radii 10 cm and 8 cm. What is the maximum number of non-overlapping unit circles that can be inscribed between these two circles?

 

 Dec 23, 2019
 #2
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Besides those 4 small circles, it's possible to inscribe 24 more corcles.  smiley

 Dec 23, 2019
edited by Guest  Dec 23, 2019
edited by Guest  Dec 23, 2019
 #3
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What happened to my answer I posted last night?  I got 28 circles, too.  What's more, I explained how to get the answer. 

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 Dec 23, 2019

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