What is "radius"

Radius \Ra"di*us\ (r[=a]"d[i^]*[u^]s), n.; pl. L. Radii (r[=a]"d[i^]*[imac]); E. Radiuses (r[=a]"d[i^]*[u^]s*[e^]z). [L., a staff, rod, spoke of a wheel, radius, ray. See Ray a divergent line.]

1. (Geom.) A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere.

2. (Anat.) The preaxial bone of the forearm, or brachium, corresponding to the tibia of the hind limb. See Illust. of Artiodactyla.

   Note: The radius is on the same side of the limb as the thumb, or pollex, and in man it is so articulated that its lower end is capable of partial rotation about the uln

3. (Bot.) A ray, or outer floret, of the capitulum of such plants as the sunflower and the daisy. See Ray, 2.

4. pl. (Zo["o]l.)

   1. The barbs of a perfect feather.

   2. Radiating organs, or color-markings, of the radiates.

5. The movable limb of a sextant or other angular instrument.
   --Knight.

   Radius bar (Mach.), a bar pivoted at one end, about which it swings, and having its other end attached to a piece which it causes to move in a circular arc.

   Radius of curvature. See under Curvature.

1590s, "cross-shaft," from Latin radius "staff, stake, rod; spoke of a wheel; ray of light, beam of light; radius of a circle," of unknown origin. Perhaps related to radix "root," but Tucker suggests connection to Sanskrit vardhate "rises, makes grow," via root *neredh- "rise, out, extend forth;" or else Greek ardis "sharp point."\n

\nThe geometric sense first recorded 1610s. Plural is radii. Meaning "circular area of defined distance around some place" is attested from 1953. Meaning "shorter bone of the forearm" is from 1610s in English (the Latin word had been used thus by the Romans).

n. 1 (context anatomy English) The long bone in the forearm, on the side of the thumb. 2 (context zoology English) The lighter bone (or fused portion of bone) in the forelimb of an animal. 3 (context entomology English) One of the major veins of the insect wing, between the subcosta and the media 4 (context geometry English) A line segment between any point on the circumference of a circle and its center/centre. 5 (context geometry English) The length of this line segment.

1. n. the length of a line segment between the center and circumference of a circle or sphere [syn: r]

2. a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)

3. a circular region whose area is indicated by the length of its radius; "they located it within a radius of 2 miles"

4. the outer and slightly shorter of the two bones of the human forearm

5. support consisting of a radial member of a wheel joining the hub to the rim [syn: spoke]

6. [also: radii (pl)]

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

Radius may also refer to:

1. redirect Distance (graph theory)

Radius (Jared Corbo) is a fictional character, a superhero in the Marvel Comics universe. He is a former member of the superhero team Alpha Flight. He first appeared in Alpha Flight: In The Beginning #-1, and first appeared as Radius in Alpha Flight vol. 2 #1 (both published in 1998).

Radius Travel is a privately held global travel management company with headquarters in Bethesda, MD, USA. Radius designs and delivers travel programs for multinational companies through a network of travel agencies. The Radius network operates across more than 80 countries and manages over $23 billion UDF of annual corporate travel spending.

The company has existed in its present form since 1992 as a result of a merger between two independent North American travel management companies.

Radius is a software company that provides a marketing platform for targeting small businesses. The company tracks and collects information from hundreds of thousands of sources about more than 25 million small businesses in the United States. The company has publicly stated it plans to build products that are directly competitive with Dun & Bradstreet.

In classical geometry, the radius of a circle or sphere is 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:

$$d \doteq 2r \quad \Rightarrow \quad r = \frac{d}{2}.$$

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.

The radius of the circle with perimeter ( circumference) C is

$$r = \frac{C}{2\pi}.$$

Alternatively, this can be expressed as

$$r = \frac{C}{\tau}.$$

, with τ (tau) being equal to 2π exactly, although this has yet to gain mainstream usage.

The radius or radial bone is one of the two large bones of the forearm, the other being the ulna. It extends from the lateral side of the elbow to the thumb side of the wrist and runs parallel to the ulna, which exceeds it in length and size. It is a long bone, prism-shaped and slightly curved longitudinally.

The radius is part of two joints: the elbow and the wrist. At the elbow, it joins with the capitulum of the humerus, and in separate region, the ulna at the radial notch. At the wrist, the radius forms a joint with the ulna bone.

The corresponding bone in the lower leg is the tibia.

Radius was an American computer hardware firm founded in May 1986 by Burrell Smith, Andy Hertzfeld, Mike Boich, Matt Carter, Alain Rossmann and other members of the original Mac team. The company specialized in Macintosh peripherals and accessory equipment. It completed its IPO in 1990.

Their products ranged from processor upgrade cards (Radius Accelerator) bringing Motorola 68020 processors to earlier Macintosh systems; graphics accelerators (Radius QuickColor); television tuners (RadiusTV); video capture cards (VideoVision); color calibrators (PrecisionColor); multi-processor systems (Radius Rocket) for 3D rendering and multiple OS sessions; high-end video adapters and monitors.

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.

September 2010 Radius began working with producer and world class mixing engineer David J. Holman. Holman is best known for his work with multi-platinum artist Olivia Newton-John, No Doubt Tragic Kingdom, Bush albums Sixteen Stone and Razorblade Suitcase, Adema, and Sick Puppies. Holman discovered Radius while the band was performing at the House of Blues Disney in Anaheim, California August 2010. Holman co-produced Radius song "Just Say" fall of 2010 and the song was released November 2010.

Summer 2011, Radius began working on their first full-length release. Projected release date is in January 2012.

Category:Musical groups from Los Angeles, California

Radius is a London music ensemble founded in 2007 by the British composer Tim Benjamin. The ensemble specialises in the performance of new music from around the world (though primarily in the Western classical music tradition) written by living composers and 20th-century masters. The ensemble's artistic director is the British composer Ian Vine, a contemporary of Tim Benjamin at the Royal Northern College of Music from 1994 to 1997. Modelled on the 1960s ensemble The Fires of London, (which in turn was derived from the instrumentation of Schoenberg's Pierrot Lunaire), the core instrumental line-up of Radius is flute, clarinet, violin, cello, piano, and percussion. To this instrumentation have been added trumpet, trombone, French horn, actors, and vocalists, as required for the performance of specific works.

Although Radius is usually unconducted, the ensemble was conducted by John Traill (musician) for performances of Tim Benjamin's The Corley Conspiracy at London's Southbank Centre in September 2007, directed by Sean Starke. Radius has performed at the Purcell Room at the Southbank Centre in London, the Wigmore Hall in London, and the Holywell Music Room in Oxford.