This watch has a rule. The diameter is just the diameter of the previous runway plus 2.5, while the circumference and total length of the previous runway should be added with 7.85. The diameters are: 72.6, 75. 1, 77.6, 80. 1, 82.6, 85. 1, 87.6, 90. The perimeter is: 228.08, 235.93, 243.78, 25 1.63, 259.48, 267.33, 275.18,283.03, and the total length is: 400,407.85, 4/. I finally found this! ! ! ! !