because it has more than one diameter
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more than one radius
It is the radius. More than one are radii. All the way across is the diameter.
If the radius is two. it won't be a unit circle, a unit circle is defined as a circle with radius one.
The radius is the distance from the center of the circle to its edge. No matter how you draw this radius, it is one value of one length only, for any given circle.
One half. The diameter of a circle is always twice the radius.