## Radius Wiki - What is the radius?

In classical geometry, a radius of a circle or sphere is any of the line segments from its center to its perimeter, and in more modern usage, it is also their length. The name comes from the 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 mathematical variable name for radius is r. By extension, the diameter d is defined as twice the radius: d ≐ 2 r ⇒ r = d 2 . {\displaystyle 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 = C 2 π . {\displaystyle r={\frac {C}{2\pi }}.} .

What does the word radius mean? Find synonyms, antonyms and the meaning of the word **radius** in our free online dictionary!
Find words starting with *radius* and anagrams of __radius__.

## Definitions of "radius"

- Mathematics A line segment that joins the center of a circle with any point on its circumference. noun
- Mathematics A line segment that joins the center of a sphere with any point on its surface. noun
- Mathematics A line segment that joins the center of a regular polygon with any of its vertices. noun
- Mathematics The length of any such line segment. noun
- A circular area measured by a given radius: every family within a radius of 25 miles of the city center. noun
- A bounded range of effective activity or influence: the operating radius of a helicopter. noun
- A radial part or structure, such as a mechanically pivoted arm or the spoke of a wheel. noun
- Anatomy A long, prismatic, slightly curved bone, the shorter and thicker of the two forearm bones, located on the lateral side of the ulna. noun
- Anatomy A similar bone in many vertebrates. noun
- The long bone in the forearm, on the side of the thumb. noun
- The lighter bone (or fused portion of bone) in the forelimb of an animal. noun
- A line segment between any point on the circumference of a circle and its center/centre. noun
- The length of this line segment. noun
- A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere. noun
- The preaxial bone of the forearm, or brachium, corresponding to the tibia of the hind limb. See Illust. of Artiodactyla. noun
- A ray, or outer floret, of the capitulum of such plants as the sunflower and the daisy. See Ray, 2. noun
- noun
- The barbs of a perfect feather. noun
- Radiating organs, or color-markings, of the radiates. noun

## The word "radius" in example sentences

The radius, _p b_, of the upper circle is termed the _crater radius_; the line _o p_, drawn from the centre of the charge perpendicular to the surface where the explosion takes place, is termed the _line of least resistance_; the line _o b_, drawn from the centre of the powder to any point in the circumference of the upper circle, is termed the _radius of explosion_.. [Elements of Military Art and Science Or, Course Of Instruction In Strategy, Fortification, Tactics Of Battles, &C.; Embracing The Duties Of Staff, Infantry, Cavalry, Artillery, And Engineers; Adapted To The Use Of Volunteers And Militia; Third Edition; With Critical Notes On The Mexican And Crimean Wars.]

Not to mention I live near Philadelphia, PA and he will not shoot outside of a certain radius away from the city, which would mean filming of BD would be nearby.. [Twilight Lexicon » Add M. Night Shyamalan to the Breaking Dawn Director Pile]

Indeed, Mars's satellite Phobos, whose mean radius is 11.1 km, has a numerically similar escape velocity of 11.3 metres per second - as you may vaguely remember fron Arthur C. Clarke's story, "Hide-and-Seek".. [Chris Lightfoot's quiz]

Since the Earth's radius is around 6400 km, I could probably jump off a celestial body of the Earth's density which had a radius of about 2.7 km or smaller. [Chris Lightfoot's quiz]

The moz-border-radius is understood by all mozilla based browsers such as Firefox.. [Web Teacher › Style a fieldset with rounded corners using CSS]

Daniel – not sure what that wide radius is but I can think of two places with good fried foods.. [Downtown Lunch: A Sea World That Would Fry Shamu if They Could | Midtown Lunch: Downtown NYC]

At only 30 feet tall and 2 feet in radius, Windspire is distinguished by its sleek propeller-free design, ultra quiet operation, rugged construction, and affordable pricing.. [Sustainable Design Update » Blog Archive » Windspire]

So we went outside and, lo and behold, about 20 degrees* in radius around the Moon was a nearly complete halo!. [Archive 2008-09-15]

And, indeed, I would agree with that ranking, but the only reason we want a sphere of autonomy is because we happen to be sympathetic to ranking freedoms according to their radius from the center of the sphere of autonomy.. [The Nanny Two-Step]

Thus the clockwork Earth is (2,575,342/2pi = 409,878 km) in radius (about 64x our Earth's). [Mainspring - orbital dynamics]

Purel, flu shots for everyone and the mommy-evil-eye directed at anyone hacking up a lung or sucking snot in a 25 foot radius is still very much our reality.. [12 « November « 2007 « Adventures in Juggling]

Of course everyone in a 20 foot radius is staring because he does have a rather booming voice that carries.. [13 « September « 2006 « Adventures in Juggling]

College radio stations here are only licensed to transmit within a mile radius from the center of campus.. [Another Music Permission]

Rumor has it that the security will clamp down a zone encompassing a three to five-mile radius from the campus, which probably includes my house.. [September 2004]

Wireless tags are small modules comprised of a very small (typically less than a millimeter in radius) wireless communications IC and an antenna.. [Smart Mobs » Blog Archive » Japan Moves to Establish Leadership in RFID Technology]

The vertical defocusing arising from the increase of the average magnetic field with radius is compensated by the vertical focusing due to the azimuthal variation of the field.. [Accelerators and Nobel Laureates]

## Radius Translates

**Radius English to Turkish Translate**

i. (çoğ. radii, radiuses) yarıçap; anat. radyus, önkol kemiği, döner kemik, dal kemik; yarıçap ile ölçülen daire ölçümü. radius vector sabit bir noktadan hareket eden bir cisme olan uzaklık; astr. güneş ile bir gezegen arasındaki değişken uzaklık.i. (çoğ. radii, radiuses) yarıçap; anat. radyus, önkol kemiği, döner kemik, dal kemik; yarıçap ile ölçülen daire ölçümü. radius vector sabit bir noktadan hareket eden bir cisme olan uzaklık; astr. güneş ile bir gezegen arasındaki değişken uzaklık.

## Radius Comments