8
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"When you draw a circle in a plane of radius $1$ you can perfectly surround it with $6$ other circles of the same radius."

BUT when you draw a circle in a plane of radius $1$ and try to perfectly surround the central circle with $7$ circles you have to change the radius of the surround circles.

How can I find the radius of the surround circles if I want to use more that $6$ circles?

ex : $7$ circles of radius $0.4$

$8$ circles of radius $0.2$

  • 0
    have to chance or have to change ?2010-11-28
  • 0
    "have to change" sorry.2010-11-28
  • 0
    [This](http://math.stackexchange.com/questions/10648) is related.2010-11-28

2 Answers 2