The diameter.
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diameter
It is the radius
360 degrees * * * * * That is a nonsensical answer. The diameter of a circle is a straight line segment, going from the circumference of the circle, through the centre, to the circumference on the other side.
The length of a straight line from the centre of a circle to the edge of the circle.
No, it is the distance from the centre to any point on the perimeter in a straight line.