"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 too use more that 6 cirles?
ex : 7 circles = radius 0.4
8 circles = radius 0.2