The x and y axes
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line
It is called the diameter. The line that goes halfway through the circle is the radius.The length of a straight line through the center of a circle is called the diameter. Any other object I'm not sure has a name; perhaps the length...width...or height
The origin.
You may call it the intersections of two perpendicular axis. In terms of coordinates, origin is also referred to as (0, 0).
Jamie - of Spanish origin meaning to supplant or the supplanter