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等份圆周弦长 数R 等份数 系数R 等份数 系数R 31.7321170.3676 41.4142180.3473 51.1756190.3292 6 1.000200.3129 70.8678210.2980 80.7654220.2845 90.6840230.2723 100.6180240.2611 110.5635250.2507 120.5176260.2411 130.4786270.2321 140.4450280.2240 150.4158290.2162 140.4450280.2240 160.3902300.2091 310.2023320.1960