What are radius?

  • (noun): A circular region whose area is indicated by the length of its radius.
    Example: "They located it within a radius of 2 miles"
    See also — Additional definitions below


Remote Authentication Dial In User Service (RADIUS) is a networking protocol that provides centralized Authentication, Authorization, and Accounting (AAA) management for computers to connect and use a network service. RADIUS was developed by Livingston Enterprises, Inc., in 1991 as an access server authentication and accounting protocol and later brought into the Internet Engineering Task Force (IETF) standards.

Read more about Radius.

Some articles on radius:

... The RADIUS protocol is currently defined in the following IETF RFCs Obsolete RFCs are indicated with strikethrough text ... by Notes RFC 2058 Remote Authentication Dial In User Service (RADIUS) January 1997 RADIUS RFC 2138 RFC 2059 RADIUS Accounting January 1997 RADIUS RFC 2139 RFC 2138 Remote ...
Bubble Chart - Choosing Bubble Sizes Correctly
... of a disk—unlike its diameter or circumference—is not proportional to its radius, but to the square of the radius ... To get a properly weighted scale, one must scale each disk's radius to the square root of the corresponding data value v3 or scale each disk's circumference to the ... this way, but also be clearly labeled to document that it is area, rather than radius or diameter, that conveys the data ...
Archimedes' Quadruplets - Construction
... r2, from which it follows that the larger semicircle has radius r = r1+r2 ... and midpoint, respectively, of the semicircle with the radius r1 ... other two quadruplet circles are formed in a symmetric way from the semicircle with radius r2 ...
Covering Radius
... In mathematics, the covering radius of a collection of points P in a metric space is the smallest r > 0 such that spheres of radius r around the points P will completely cover the space ...
Spherical Mean - Definition
... a point in U and r > 0 be such that the closed ball B(x, r) of center x and radius r is contained in U ... The spherical mean over the sphere of radius r centered at x is defined as where ∂B(x, r) is the (n−1)-sphere forming the boundary of B(x, r), dS denotes integration with ... mean is given by where ωn−1 is the area of the (n−1)-sphere of radius 1 ...

More definitions of "radius":

  • (noun): A straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere).
  • (noun): The outer and slightly shorter of the two bones of the human forearm.
  • (noun): Support consisting of a radial member of a wheel joining the hub to the rim.
    Synonyms: spoke
  • (noun): The length of a line segment between the center and circumference of a circle or sphere.
    Synonyms: r