I wrote:
> 
> > Does anybody know the equation for this?
> 
> D = distance from camera to plane
> A = angle of view
> S = width of puzzle
> 
> D = (S/2) / tan(A);

Of course, this is assuming your camera is position in the middle of the puzzle
and look a it directly:

   Camera
   |
   V
   :
   :
   :
_______

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