Carnot's theorem or Carnot's principle may refer to:
In geometry:
- Carnot's theorem (inradius, circumradius), describing a property of the incircle and the circumcircle of a triangle
- Carnot's theorem (conics), describing a relation between triangles and conic sections
- Carnot's theorem (perpendiculars), describing a property of certain perpendiculars on triangle sides
In physics:
- Carnot's theorem (thermodynamics), setting a maximum efficiency obtainable from a heat engine
See also
- Carnot cycle, in thermodynamics
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