350px|right|thumb|[[Ford circles.]]

This list of circle topics includes things related to the geometric shape, either abstractly, as in idealizations studied by geometers, or concretely in physical space. It does not include metaphors like "inner circle" or "circular reasoning" in which the word does not refer literally to the geometric shape.

Geometry and other areas of mathematics

  • Circle

; Circle anatomy

  • Measurement of a Circle

; Specific circles

  • Archimedes' circles – the twin circles doubtfully attributed to Archimedes
  • Circumscribed circle (circumcircle)
  • Woo circles

; Circle-derived entities

  • Tangential quadrilateral

:; Roulettes

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::* Deltoid curve

:; Topology

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:* Quasicircle

; Circle-related theory

  • Introduction to Circle Packing – a book by Kenneth Stephenson
  • Thales' theorem

; Circle tangents in non-geometric theory

  • Wrapped normal distribution

; Other topics

  • Thomas Baxter (mathematician)

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hidden for one version change because they seem to little relevancy to circles Homothetic center, * Isodynamic point, * Lemoine line, * Peaucellier&ndash;Lipkin linkage, * Proof that pi is irrational, * Robbins pentagon, * Schoch line -->

Physical sciences and engineering

Geography

thumb|right|A great circle on a sphere

  • Position circle

Artifacts

thumb|A driving wheel on a [[steam locomotive.]]

  • Wheel

Glyphs and symbols

  • Solar symbols
  • Yin and yang

See also

  • Circle symbol