The following is the schematic diagram of 200m runway, with its end point and starting point on the straight track. As the middle of the runway bypasses the semicircle, the starting point of the outer runway should be moved forward. If each runway is 1.2m wide, how many meters should the starting point of the outer runway be moved forward? (accurate to 0.1M)

The following is the schematic diagram of 200m runway, with its end point and starting point on the straight track. As the middle of the runway bypasses the semicircle, the starting point of the outer runway should be moved forward. If each runway is 1.2m wide, how many meters should the starting point of the outer runway be moved forward? (accurate to 0.1M)

The difference between the two runways lies in the different radii of the two arcs. From the meaning of the title, we can know that the radii of the two circles differ by 1.2, and the two arcs can be seen from the figure as semicircles, so according to the arc length formula 180 π × 1.2180 = 1.2 × 3.14 = 3.768 ≈ 3.8 (m); a: the starting point of the outer runway should be moved forward by 3.8 M