List of circle topics

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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[edit]

Circle anatomy
Specific circles
Circle-derived entities
Circle-related theory
Circle tangents in non-geometric theory
Other topics

Physical sciences and engineering[edit]


A great circle on a sphere


A driving wheel on a steam locomotive.

Glyphs and symbols[edit]

See also[edit]