Respuesta :

LammettHash
The distance between any point on the sphere and its center is the radius. The origin is on the sphere, so the radius [tex]r[/tex] satisfies

[tex]r^2=(1-0)^2+(-7-0)^2+(9-0)^2=131[/tex]

This means the equation of the circle is

[tex](x-1)^2+(y+7)^2+(z-9)^2=131[/tex]

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