Radius

In classical geometry, the radius of a circle or sphere is a the length of a line segment from its center to its perimeter. The name comes from Latin radius, meaning "ray" but also the spoke of a chariot wheel. The plural of radius can be either radii (from the Latin plural) or the conventional English plural radiuses. The typical abbreviation and mathematic variable name for "radius" is r. By extension, the diameter d is defined as twice the radius:

If an object does not have a center, the term may refer to its circumradius, the radius of its circumscribed circle or circumscribed sphere. In either case, the radius may be more than half the diameter, which is usually defined as the maximum distance between any two points of the figure. 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.

For regular polygons, the radius is the same as its circumradius. The inradius of a regular polygon is also called apothem. In 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.

Radius (band)

Radius an alternative rock band from Los Angeles, California, has been noted as a band on the rise with their feel-good rock anthems. Radius captures a timeless sound, creating an emotional listening experience. Radius has been compared to Coldplay, U2, Snow Patrol, & Wallflowers. 2006 - 2008 Songs by Radius have been licensed for use in nationally broadcast Victoria's Secret television commercials, WB's TV show One Tree Hill, the NBC primetime show Las Vegas and several network television shows and movies on NBC, ABC, CBS, and syndicated programs. June 2009, Radius signed a production contract with acclaimed producer Stephen Short. The band recorded six songs produced by Stephen Short at Sonic Ranch Studios in El Paso, Texas. The band released the six songs on an EP titled Crossing Over in November 2009. In November 2009, Radius song "My World" was nominated for best rock song at the Hollywood Music Awards.

That same month, "My World" was featured in PBS special speaking out about the Chernobyl Children's Project International. Radius went on a tour through Canada with multi-platinum recording artist Everclear in April 2010.

Radius (disambiguation)

A radius is a straight line or distance from the center to the edge of a curve.

Radius may also refer to:

In arts and entertainment

Companies

People

In mathematics