The centre of a circle is simply called the cnetre. The edge may called the perimeter, the circumference or the edge.
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This line is called a radius.
it is called a diameter.The diameter !I think this answers your question:A segment whose end points both rest on the same circle and which passes through the center of the same circle is called the circle's diameter.a line from the edge of a circle through the center to the other side is the diameterRadiusDiameter
Radius.
radius
Isn't it the radii?