This list of circle topics is not intended for metaphorical circles, but rather for topics related to the geometric shape. Thus, for example, a link to inner circle does not belong here. In language, a metaphor is a rhetorical trope where a comparison is made between two seemingly unrelated subjects. ...

Geometry

• Apollonian gasket
• Bertrand's paradox (probability)
• Buffon's needle
• Butterfly theorem
• Circle
• Circle group
• Circumference
• Circumscribed circle
• Descartes' theorem
• Diameter
• Dividing a circle into areas
• Ford circle
• Great circle
  • Great circle distance
  • Small circle
• Hadamard three-circle theorem
• Hardy-Littlewood circle method
• Inscribed angle
• Inscribed circle
• Inversive geometry
• Isoperimetric problem
• List of topics related to pi
• Malfatti circles
• Mrs. Miniver's problem
• Nine-point circle
• Osculating circle
• π (pi)
• Radius
• Ruler-and-compass construction
  • Mohr-Mascheroni theorem
  • Poncelet-Steiner theorem
• Semicircle
• Squaring the circle
• Tarski's circle-squaring problem
• Unit circle
• Villarceau circles
• Wigner semicircle distribution

In mathematics, an Apollonian gasket or Apollonian net is a fractal generated from three circles, any two of which are tangent to one another. ... Butterfly theorem is a classical result in Euclidean geometry, it can be stated as follows: Let M be the midpoint of a chord PQ of a circle, through which two other chords AB and CD are drawn; AD and BC intersect chord PQ at X and Y correspondingly. ... In Euclidean geometry, a circle is the set of all points in a plane at a fixed distance, called the radius, from a fixed point, called the centre. ... The circumference is the distance around a closed curve. ... In geometry, Descartes theorem establishes a relationship between four kissing, or mutually tangent, circles. ... For the geometric term, see diameter. ... In geometry, an inscribed angle is formed when two secant lines of a circle (or, in a degenerate case, when one secant line and one tangent line of that circle) intersect on the circle. ... In mathematics, inversive geometry is the geometry of circles and the set of transformations that map all circles into circles. ... This is a list of topics related to π (pi), the fundamental mathematical constant. ... Construct three circles inside a given triangle such that each circle is tangent to the other two and to two sides of the triangle. ... Mrs. ... In geometry, the nine point circle is a circle that can be constructed for any given triangle. ... The minuscule, or lower-case, pi The mathematical constant π represents the ratio of a circles circumference to its diameter and is commonly used in mathematics, physics, and engineering. ... A number of ancient problems in geometry involve the construction of lengths or angles using only an idealized ruler and compass, or more properly a straightedge and compass. ... In geometry, the Poncelet-Steiner theorem on ruler-and-compass constructions states that whatever can be constructed by straightedge with compass, can be constructed by straightedge alone, if you are given a single circle and the location of its centre. ... A semicircle is a two-dimensional geometric shape that forms half of a circle. ... The Wigner semicircle distribution, named after the physicist Eugene Wigner, is the probability distribution supported on the interval [−R, R] the graph of whose probability density function f is a semicircle of radius R centered at (0, 0) and then suitably normalized (so that it is really a semi-ellipse...

Geography

• Arctic circle
• Antarctic circle
• Circle of latitude
• Equator
• Great circle
  • Great circle distance
  • Small circle
• Position circle

Arctic Circle - Wikipedia /**/ @import /skins/monobook/IE50Fixes. ... Zoomable PDF of the map this is based on The Antarctic Circle is one of the five major circles of latitude that mark maps of the Earth. ... The 5 main circles of latitude on Earth A circle of latitude is an imaginary east-west circle on the Earth, that connects all locations with a given latitude. ... The equator is an imaginary line drawn around a planet, halfway between the poles. ... A great circle is a circle on the surface of a sphere that has the same diameter as the sphere, dividing the sphere into two equal hemispheres. ... A position circle is a circle that can be measured both from a chart and from the surface of the earth for the purpose of position fixing. ...

Artifacts

• Compass (drafting)
• Crop circle
• Dip circle
• Timber circle
• Traffic circle
• Stone circle

Categories: Math stubs | Mathematical tools ... A crop circle pattern Crop circles are areas of a grain or similar crop that have been systematically flattened to form various geometric patterns. ... In archaeology, a timber circle is a circular arrangement of wooden posts. ... A traffic circle is an intersection with a circular shape and, usually, a central island. ... Prehistoric stone circles are megalithic monuments found almost exclusively in the British Isles, with two atypical examples known in Brittany. ...

Glyphs and symbols

• Circle with a point at its center
• Circles in Polish mythology
• Magic circle (Wicca)
• Squared-circle postmark