What is circle?

  • (noun): A road junction at which traffic streams circularly around a central island.
    Synonyms: traffic circle, rotary, roundabout
    See also — Additional definitions below


A circle is a simple shape of Euclidean geometry that is the set of all points in the plane that are equidistant from a given point, the centre. The distance between any of the points and the centre is called the radius.

Read more about Circle.

Some articles on circle:

Osculating Circle
... In differential geometry of curves, the osculating circle of a sufficiently smooth plane curve at a given point p on the curve has been traditionally defined as the ... This circle, which is the one among all tangent circles at the given point that approaches the curve most tightly, was named circulus osculans (Latin for "kissing ... The center and radius of the osculating circle at a given point are called center of curvature and radius of curvature of the curve at that point ...
Circle, Montana - Demographics
... There were 291 households out of which 27.8% had children under the age of 18 living with them, 56.0% were married couples living together, 5.5% had a female householder with no husband present, and 36.1% were non-families. 34.4% of all households were made up of individuals and 19.6% had someone living alone who was 65 years of age or older ...
Descartes' Theorem - Definition of Curvature
... is most easily stated in terms of the circles' curvatures ... The curvature (or bend) of a circle is defined as k = ±1/r, where r is its radius ... The larger a circle, the smaller is the magnitude of its curvature, and vice versa ...
Lucius Cary, 2nd Viscount Falkland - Great Tew Circle
... For more details on this topic, see Great Tew Circle ... Great Tew he enjoyed a short but happy period of study, and he assembled a cultured circle, whom the near neighbourhood of the university and his own brilliant qualities attracted to ...
Wolfram & Hart - Operations - Circle of The Black Thorn
... The members of the circle act as the earthly instruments of the Senior Partners, charged with being the driving force behind Wolfram Hart's apocalyptic plans and dedicated to ... The members of the Circle do this not from a belief in evil per se, but because being a Black Thorn allows them to amass power for themselves and wield that power with impunity ... The Circle's lineup in 2004 is Archduke Sebassis Senator Helen Brucker Cyvus Vail Ed, Grand Potentate of the Fell Brethren the leader of the Sahrvin Clan Izzerial the Devil and three ...

More definitions of "circle":

  • (noun): A curved section or tier of seats in a hall or theater or opera house; usually the first tier above the orchestra.
    Example: "They had excellent seats in the dress circle"
    Synonyms: dress circle
  • (noun): Any circular or rotating mechanism.
    Synonyms: round
  • (noun): An unofficial association of people or groups.
    Synonyms: set, band, lot
  • (verb): Form a circle around.
    Synonyms: encircle
  • (noun): Movement once around a course.
    Synonyms: lap, circuit
  • (noun): Something approximating the shape of a circle.
    Example: "The chairs were arranged in a circle"
  • (verb): Move in circles.
    Synonyms: circulate
  • (verb): Travel around something.
    Example: "Circle the globe"
  • (noun): Ellipse in which the two axes are of equal length; a plane curve generated by one point moving at a constant distance from a fixed point.
    Example: "He calculated the circumference of the circle"

Famous quotes containing the word circle:

    Writing about an idea frees me of it. Thinking about it is a circle of repetitions.
    Mason Cooley (b. 1927)

    The passion of love is essentially selfish, while motherhood widens the circle of our feelings.
    Honoré De Balzac (1799–1850)

    It was my heaven’s extremest sphere,
    The pale which held that lovely deer;
    My joy, my grief, my hope, my love,
    Did all within this circle move!
    Edmund Waller (1606–1687)