A segment of a circle is an area enclosed by a chord and an arc.
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You need some more information about any of the circles, or about the relationship between the two circles, to answer this question.
A "line" doesn't stop and doesn't have ends. A "segment" does and has.
C=2(pi)r
NO, a circle is not a polygon. A polygon is composed of a finite set of straight line segments, and a circle has NO straight line segments.
Their circumferences are in direct proportion to their radii. Their areas are in direct proportion to the square of their radii.