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6 circles problem

 
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Jul8-08, 08:02 AM   #1
KKW
 

6 circles problem

If you inscribe 4 circles inside a bigger circle and then add another smaller circle, touching the other 4 circles, what is the radius of the smallest circle (in the centre) if the radius of the biggest circle is 10cm?
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Jul8-08, 09:26 AM   #2
 
Is the radius of the four circles the same?
Jul8-08, 10:51 AM   #3
 
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Assuming four circles are identical, that's everything you may need. Think how these are related to the radii of circles in question.
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