直径1根2根3根4根5根6根7根8根9根10根11根12根13根14根15根16根
3 7.1 14.2 21.3 28.4 35.5 42.6 49.7 56.8 63.9 71 78.1 85.2 92.3 99.4 106.5 113.6
4 12.6 25.2 37.8 50.4 63 75.6 88.2 100.8 113.4 126 138.6 151.2 163.8 176.4 189 201.6
5 19.6 39.2 58.8 78.4 98 117.6 137.2 156.8 176.4 196 215.6 235.2 254.8 274.4 294 313.6
6 28.3 56.6 84.9 113.2 141.5 169.8 198.1 226.4 254.7 283 311.3 339.6 367.9 396.2 424.5 452.8
6.5 33.2 66.4 99.6 132.8 166 199.2 232.4 265.6 298.8 332 365.2 398.4 431.6 464.8 498 531.2
8 50.3 100.6 150.9 201.2 251.5 301.8 352.1 402.4 452.7 503 553.3 603.6 653.9 704.2 754.5 804.8
8.2 52.8 105.6 158.4 211.2 264 316.8 369.6 422.4 475.2 528 580.8 633.6 686.4 739.2 792 844.8
10 78.5 157 235.5 314 392.5 471 549.5 628 706.5 785 863.5 942 1020.5 1099 1177.5 1256
12 113.1 226.2 339.3 452.4 565.5 678.6 791.7 904.8 1017.9 1131 1244.1 1357.2 1470.3 1583.4 1696.5 1809.6
14 153.9 307.8 461.7 615.6 769.5 923.4 1077.3 1231.2 1385.1 1539 1692.9 1846.8 2000.7 2154.6 2308.5 2462.4
16 201.1