It's the circle's radius which extends from its center to its circumference and it can be of any length you want it to be.
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It is the circle's circumference
The length of a straight line from the centre of a circle to the edge of the circle.
It depends on what information you have: radius, diameter, lengths of tangents from a point outside the circle, length of chord and its distance from the centre, etc. Also, the term is circumference, not circumfrence.
From the centre of a circle to the outside edge is known as the radius.
The radius of a circle is defined as the distance from the centre-point to the circumference.