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 Question from kanika, a student: equation of sphere and how to know its center

Kanika,

The equation of the sphere with center $(a, b, c)$ and radius $r$ is

$(x - a)^2 + (y - b)^2 + (z - c)^2 = r^2.$

If you have an equation that is the equation of a sphere and you can put it in the form above then the center is $(a, b, c).$

I hope this helps,
Penny

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