40eced70_Geometry_circles__Part
[Description] A chord that passes through the center of a circle. [Example] AB is a diameter. [Properties] A diameter is twice the radius d = 2r. It is always passes through the center. It is the longest chord of a circle. [Part] 
Diameter
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