It is a chord and the diameter of a circle is its largest chord.
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Depending on what you mean by "edge", it could be a chord or it could be the diameter (which is a special case of a chord).
diameter.
Is called a radius.
It's called a "chord" of the circle. If it happens to go through the center of the circle,then it's also called a "diameter" of the circle, and no other chord in the same circlecan be longer.
A line segment with the center of a circle as one endpoint and the other endpoint on the circumference of the circle is a rdius of that circle.
Such a line segment would be a radius of the circle.