"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 $0.2$
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