Based on the given figure of a plate above, the inner and the outer rims are called CONCENTRIC CIRCLES. By definition, concentric circles are circles having the same or common centers. And in the figure, both the outer and the inner rims have a common center. In addition, t<span>he part between two </span>concentric circles<span> of different radii is called an annulus. Hope this is the answer that you are looking for.</span>
The answer is concentric circles because the other options just don't make sense. Concentric secants, radius, and chords do not look like that. They have different meanings and also I took a test for FLVS and got it right I did a lesson on how it explains the meanings of each of the terms I just said and it does not match the explanation.
