The line that is traced in the picture is actually a line within the object. It represents where the two pieces were combined, plus it also shows the line in which the pattern of the nozzles follow. Without this line to arrange the nozzles the water pressure would not be spread out, and then the shower would not be as useful. Also this is the way the pieces were attached. This shape is a 36 sided polygon, since it has 36 sides and is a closed shape without curves.
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