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.
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Geometry and other areas of mathematics
- Annulus (mathematics)
- Apollonian circles
- Apollonian gasket
- Arbelos
- Archimedean circle
- Archimedes' circles
- Archimedes' quadruplets
- Area of a disk
- Bankoff circle
- Belt problem
- Bertrand's paradox (probability)
- Bipolar coordinates
- Borromean rings
- Brahmagupta's formula
- Brocard circle
- Buffon's needle
- Butterfly theorem
- Carnot's theorem
- Casey's theorem
- Centered trochoid
- Circle
- Central angle
- Circle bundle
- Circle graph
- Circle group
- Circle map
- Circle packing
- Circle packing theorem
- Circles of Apollonius
- Circle of antisimilitude
- Circular algebraic curve
- Circular sector
- Circular segment
- Circular statistics
- Circular surface
- Circumference
- Circumscribed circle — Circumcircle
- Clifford's circle theorems
- Coaxal circles
- Concentric
- Concyclic
- Coxeter's loxodromic sequence of tangent circles
- Cyclic quadrilateral
- Cycloid
- Descartes' theorem
- Diameter
- Director circle
- Disk (mathematics)
- Dividing a circle into areas
- Epitrochoid
- Equal incircles theorem
- Fermat–Apollonius circle
- Five circles theorem
- Ford circle
- Fuhrmann circle
- Gauss circle problem
- Generalised circle
- Gershgorin circle theorem
- GEOS circle
- Great circle
- Hadamard three-circle theorem
- Hardy–Littlewood circle method
- Homothetic center
- Horocycle
- Hypotrochoid
- Incircle and excircles of a triangle
- Inscribed angle
- Inscribed angle theorem
- Inscribed circle
- Inversive distance
- Inversive geometry
- Irrational rotation
- Isodynamic point
- Isoperimetric problem
- Japanese theorem for concyclic polygons
- Japanese theorem for concyclic quadrilaterals
- Johnson circles
- Lemoine line
- Lester's theorem
- Limiting cases of Apollonius' problem
- List of topics related to π
- Lune
- Lune of Hippocrates
- Magic circle (mathematics)
- Malfatti circles
- Measurement of a Circle
- Miquel's theorem
- Monge's theorem
- Mean of circular quantities
- Mrs. Miniver's problem
- Nine-point circle
- Osculating circle
- Ortsbogen theorem
- Pappus chain
- Peaucellier-Lipkin linkage
- π (pi)
- Pivot theorem
- Pole and polar
- Poncelet's porism
- Power center (geometry)
- Power of a point
- Problem of Apollonius
- Proof that π is irrational
- Ptolemaios' theorem
- Radical axis
- Radius
- compass and straightedge
- Regiomontanus' angle maximization problem
- Riemannian circle
- Robbins pentagon
- Salinon
- Schoch line
- Schoch circles
- Semicircle
- Seven circles theorem
- Six circles theorem
- Smallest circle problem
- Spieker circle
- Splitting circle
- Squaring the circle
- Squircle
- Steiner chain
- Tammes problem
- Tangent lines to circles
- Tangent circles
- Tarski's circle-squaring problem
- Thales' theorem
- Unit circle
- Versor
- Villarceau circles
- von Mises distribution
- Wigner semicircle distribution
- Woo circles
Physics
- Centrifugal force
- Centripetal force
- Circle of confusion
- Circular orbit
- Mohr's circle
- Non-uniform circular motion
- Thomson problem
- Uniform circular motion
Geography
Artifacts
- Addendum circle
- Belt problem
- Circular ditches
- Circular slide rule
- Compass (drafting)
- Crop circle
- Dip circle
- List of gear nomenclature
- Pitch circle
- Repeating circle
- Timber circle
- Traffic circle
- Setting circles
- Stone circle
- Wheel
Glyphs and symbols
- Borromean rings
- Circled dot
- Circles in Polish mythology
- Crescent
- Enso
- Flower of Life
- Olympic emblem
- Ouroboros
- Quatrefoil
- Ring (diacritic)
- Roundel
- Sacred Chao
- Shield of the Trinity
- Solar symbols
- Squared-circle postmark
- Sun cross
- Symbol of Tanit
- Trefoil
- Triquetra
- Vesica piscis
- Triple Goddess symbol
- Yin-yang
Other
See also
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