# radius

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 |