Their circumferences are in direct proportion to their radii.
Their areas are in direct proportion to the square of their radii.
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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.
C=2(pi)r
A segment of a circle is an area enclosed by a chord and an arc.
Annulus
A straight line touches the circumference of a circle only at one point and it is a tangent line