DNφδ(φ-δ)/2k k*DN节数n1n1/2所对圆心角等份n2n2所对圆心角1200122010600 1.5180040.196349541120.5235987761
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弦长238.7 254.7 298.4 358.0 417.7 461.4 477.4 461.4 417.7 358.0 298.4 254.7 238.7 254.7 298.4 358.0 417.7 461.4 477.4 461.4 417.7 358.0 298.4 254.7 238.7