Finding radius of sphere from equation of sphere

Equation of sphere with any arbitary point (x,y,z) on its surface and center as (h,j,k) can be given  by

\[(x-h)^2+(y-j)^2+(z-k)^2=r^2 \]

Boundary condition- Radius  must be positive

 For  x=2 y=3 z=-3

         h=9 j=1 k=2

radius =8.83176

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