Clarify the Problem: First, we need to clarify the problem since it's incomplete. Assuming we're given the circumference of a circle, let's say the circumference is 2πr=18π. To find the radius, we divide the circumference by 2π.
Find the Radius: Now, for the length of the line segment AB, we need more information. If AB is a diameter of the circle, then AB=2r.
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