The length of the standard runway is 400 meters, that is, the length of the innermost runway, and knowing that the radius of the innermost runway is 36 meters, we only need to calculate the perimeters of the two semi-circular curves first. The innermost runway. Then subtract the perimeter of the two curves with 400 meters to get the length of the straight line. 400-3. 14×36×2≈ 174
174 ÷ 2 = 87m
The sum of two semicircles and two straights in the fourth lap gives the total length of the fourth runway. The length of the straight runway is known as 87, so the total length of the fourth runway is 87. × 2+2× 3.14× (36+1.2× 3) ≈ 423 meters.
The first 87× 2+2× 3.14× (36+1.2× 0) = 400.
The second 87× 2+2× 3.14× (36+1.2×1) ≈ 408.
The third 87× 2+2× 3.14× (36+1.2× 2) = 415.
The fourth 87× 2+2× 3.14× (36+1.2× 3) ≈ 423 meters.
The fifth 87× 2+2× 3.14× (36+1.2× 4) ≈ 430m.
The sixth 87× 2+2× 3.14× (36+1.2× 5) ≈ 438 meters.
The seventh 87× 2+2× 3.14× (36+1.2× 6) ≈ 445 meters.
The eighth 87× 2+2× 3.14× (36+1.2× 7) ≈ 453 meters.