As the number of sides increases indefinitely, the shape of the track approaches the shape of a circle.
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As the number of sides of the track increases, the athlete has to take turns more and more often.
The track the athlete runs on is rectangular, with four straight parts (AB, BC, CD, and DA). The athlete changes direction at the corners to stay on track.
The athlete needs to change his speed at the corners to keep himself on the track while changing direction.
The athlete runs at a uniform speed on the straight parts of the track (AB, BC, CD, and DA), but he quickly changes his speed at the corners.