The polygon does not belong to the group as it is created by a <em>finite</em> number of line segments and the concept of the radius of curvature is not applicable.
<h3>What shape is different from the others? </h3>
In this problem we have three shapes related to circle-like and ellipse-like arcs (circle, semicircle, ellipse) and a <em>regular</em> polygon.
Circles are <em>closed</em> figures created by a arc whose radius of curvature is the same at every point and ellipses are <em>closed</em> figures created by a arc whose radius of curvature varies in the following interval: a ≤ r ≤ b, where a, b are the lengths of the semiaxes.
Polygons are <em>closed</em> figures created by a <em>finite</em> number of line segments and therefore the concept of radius of curvature is not applicable.
Therefore, the polygon does not belong to the group as it is created by a <em>finite</em> number of line segments and the concept of the radius of curvature is not applicable.
To learn more on polygons: brainly.com/question/17756657
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