Its radius.
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No, it is the distance from the centre to any point on the perimeter in a straight line.
Circumference (perimeter) of a circle = pi x diameter Diameter of a circle is the straight line distance from one side to the other which passes through the centre of the circle.
It is the radius
A straight line from the center to the circumference.The distance from the center to any point on the circle
A straight line passing from side to side going through the middle of a circle or sphere is a diameter.