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This page is about Center in the context of sphere. For other uses, see Center.


By the definition of a sphere, there is one point inside it from which all straight lines falling upon it from the surface are equal.

That point is called the center of the sphere.

Linguistic Note

The British English spelling of center is centre.

The convention on $\mathsf{Pr} \infty \mathsf{fWiki}$ is to use the American English spelling center, but it is appreciated that there may be lapses.