- circular section
- circular sector
- circular segment
- circular slide rule
- circular slit domain
- circular symmetric game
- circular symmetrization
- circular symmetry
- circular torus
- circular tractrix
- circular transformation
- circular triad
- circular triangle
- circular truncated cone
- circular unit
- circular vector field
- circulating
- circulating decimal
- circulating function
- circulation
- circulatory integral
- circules
- circum-angle
- circumanticevian triangle
- circumcenter