40eced70_Geometry_circles__Part
[Description] The length of a boundary of a circle. [Example] O is the center [Properties] Every point on the circumference is equidistant from the center. [Part] 
Circum- ference
C e n t e r
R a d i u s
D i a m e t e r
C i r c u m - f e r e n c e
C h o r d
A r c
S e g m e n t
S e c t o r
S e m i c i r c l e
Geometry:circles
Part