Running tracks are oviod, not circular.
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If you mean 200 meters, then it is exactly half a lap.
Each lane is 0.9144 m wide. For one lap of the 200 m track, the distance increase per lane is 0.9144 x 2(pi) = 5.745 m Lane 1 on the start line. Lane 2 at 5.75 m Lane 3 at 11.5 m Lane 4 at 17.25 Lane 5 at 23 m
The circumference of a circle with a radius of 3 m is: 18.85 m.
72
A circle with a radius of 10 m has a circumference of 62.83 m.