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
Deltoid curve
Topology
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)
Physical sciences and engineering
Geography
Position circle
Artifacts
Wheel
Glyphs and symbols
Solar symbols
Yin and yang
See also
Circle symbol