• Find the plane containing the 2 spheres with linearization of distance constraints (by subtraction)

    𝐴𝑀2=𝐵𝑀2(𝑀𝐴)2=(𝑀𝐵)2(𝐵𝐴)𝑀=𝐵2𝐴22
  • Find radius using pythagoras

References