Find the minimal distance between any point on the sphere

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How can we find the minimal distance between any point on the sphere whose centre is 2,1,3 and radius is 1 and any point on the sphere centred at -3,2,4 and radius is 4?


is there any formula for finding this minimum distance ?
 
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find the distance between the centres, and subtract the sum of radii of the spheres...
 


thnx aniketp...that was helpful...i got my answer
 


no problem, but i hope you understood WHY this works.
 


well...yes...i have a math exam tomorrow...have to finish a LOT of things
 

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