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This page is about Radius in the context of sphere. For other uses, see Radius.
A radius of a sphere is a straight line segment whose endpoints are the center and the surface of the sphere.
The radius of a sphere is the length of one such radius.
The plural of radius is radii, pronounced ray-dee-eye.
This irregular plural form stems from the Latin origin of the word radius, meaning ray.
The ugly incorrect form radiuses can apparently be found, but rarely in a mathematical context.