then the question is,the larger radius D,the small radius d,get the largest number of small circle put in the larger?
how many smaller circles(radius is equal) I can fit within a larger circle
6
$\begingroup$
geometry
packing-problem
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5See [this](http://www.jstor.org/pss/2688509) and [this](http://www2.stetson.edu/~efriedma/cirincir/). – 2012-01-05
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2See also [Circle packing in a circle](http://en.wikipedia.org/wiki/Circle_packing_in_a_circle). – 2012-01-05
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1I believe this is still an open problem. – 2015-04-24