The radius of a circle or sphere is the distance from the center of the figure to the outer edge (or surface.)

This definition actually holds in n dimensions; so 4th and 5th and k-dimensional “spheres” have radii. Since a circle is really a 2-dimensional sphere, its “radius” is merely an instance of the general definition.

Title radius
Canonical name Radius
Date of creation 2013-03-22 12:21:02
Last modified on 2013-03-22 12:21:02
Owner akrowne (2)
Last modified by akrowne (2)
Numerical id 5
Author akrowne (2)
Entry type Definition
Classification msc 51-00
Related topic Diameter2