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 anatomy
Specific circles
Circle-derived entities
; Roulettes
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:* Deltoid curve
; Topology
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* Quasicircle
Circle-related theory
Circle tangents in non-geometric theory
Other topics
Physical sciences and engineering
Geography
Artifacts
Glyphs and symbols
See also