I have absolutely no idea where that formula comes from, considering the fact that I am a fifteen year old.
According to me, one way to think of it is to arrange 4 circles having radius equal to that of the sphere on it, but the curvatures are different so that is not possible.
Could someone please explain where the formula comes from?
Note: Please remember that I am fifteen years old.
P. S. Let me know if there are any other tags for this question except '3d' .
