Circle theorem may refer to:
- Any of many theorems related to the circle; often taught as a group in GCSE mathematics. These include:
- Inscribed angle theorem.
- Thales' theorem, if A, B and C are points on a circle where the line AC is a diameter of the circle, then the angle ∠ABC is a right angle.
- Alternate segment theorem.
- Ptolemy's theorem.
- The Milne-Thomson circle theorem in fluid dynamics.
- Five circles theorem
- Six circles theorem
- Seven circles theorem
- Gershgorin circle theorem
See also
- Clifford's circle theorems
- Descartes' theorem also known as 'kissing circles' or 'Soddy circles' theorem
- List of circle topics
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