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==Etymology==
==Etymology==
[[Latin]], [[ray]], radius
[[Latin]], [[ray]], radius
*Date: circa [http://www.wikipedia.org/wiki/17th_Century 1611]
*Date: circa [https://www.wikipedia.org/wiki/17th_Century 1611]
==Definitions==
==Definitions==
*1 : a line segment extending from the [[center]] of a [[circle]] or [[sphere]] to the [[circumference]] or bounding [[surface]]
*1 : a line segment extending from the [[center]] of a [[circle]] or [[sphere]] to the [[circumference]] or bounding [[surface]]
The inradius of a [[geometric]] figure is usually the radius of the largest [[circle]] or [[sphere]] contained in it. The inner radius of a ring, tube or other hollow object is the radius of its cavity.
The inradius of a [[geometric]] figure is usually the radius of the largest [[circle]] or [[sphere]] contained in it. The inner radius of a ring, tube or other hollow object is the radius of its cavity.
The radius of a regular polygon (or polyhedron) is the distance from its [[center]] to any of its [[vertices]]; which is also its circumradius. The inradius of a regular polygon is also called [http://en.wikipedia.org/wiki/Apothem apothem].
The radius of a regular polygon (or polyhedron) is the distance from its [[center]] to any of its [[vertices]]; which is also its circumradius. The inradius of a regular polygon is also called [https://en.wikipedia.org/wiki/Apothem apothem].
In [http://en.wikipedia.org/wiki/Graph_theory graph theory], the radius of a graph is the minimum over all [[vertices]] u of the maximum distance from u to any other [[vertex]] of the graph.
In [https://en.wikipedia.org/wiki/Graph_theory graph theory], the radius of a graph is the minimum over all [[vertices]] u of the maximum distance from u to any other [[vertex]] of the graph.
The [[name]] comes from [[Latin]] radius, meaning "ray" but also the spoke of a chariot [[wheel]]. The plural in [[English]] is radii (as in [[Latin]]), but radiuses can be used, though it rarely is.[http://en.wikipedia.org/wiki/Radius]
The [[name]] comes from [[Latin]] radius, meaning "ray" but also the spoke of a chariot [[wheel]]. The plural in [[English]] is radii (as in [[Latin]]), but radiuses can be used, though it rarely is.[https://en.wikipedia.org/wiki/Radius]
[[Category: Mathematics]]
[[Category: Mathematics]]