The image shows that the tunnel has a parabola shape.
A parabola is a mathematical term that refers to a geometric figure represented in a Cartesian plane that is characterized by representing the location of the points that are equidistant from a certain line (axis) and a fixed point (focus).
According to the above, the image represented in the Cartesian plane corresponds to a parabola because it represents the geometric figure of a curved line that joins two axes and the focus.
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Note: This question is incomplete because it is missing the graphic and the question. Here is the graph and the question.