Find the minimal distance between any point on the sphere

1. Nov 7, 2008

helix999

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 ?

2. Nov 7, 2008

aniketp

Re: spheres

find the distance between the centres, and subtract the sum of radii of the spheres....

3. Nov 7, 2008

Re: spheres

4. Nov 7, 2008

aniketp

Re: spheres

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

5. Nov 7, 2008

helix999

Re: spheres

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