圆周等分表

等分数（n)系数

（K)

30.86603

510.0615640.70711

520.06037950.58779

530.0592460.5

540.05814570.43388

550.0570980.38268

560.05607190.34202

570.055087100.30902

580.054138110.28173

590.053222120.25882

600.052336130.23932

610.051478140.22252

620.050649150.20791

630.049845160.19509

640.049067170.18375

650.048313180.17365

660.047581190.16459

670.046872200.15643

680.046183210.14904

690.045514220.14232

700.044864230.13617

710.044233240.13053

720.043619250.12533

730.043022260.12054

740.042441270.11609

750.041875280.11197

760.041325290.10812

770.040788300.10453

780.040265310.10117

790.039757320.098015

800.03926330.095056

810.038775340.092269

820.038302350.08964

830.037841360.087156

840.037391370.084805

850.036951380.08258

860.036522390.080466

870.036102400.07846

880.035692410.076549

890.035291420.074731

900.034899430.072995

910.034516440.071339

920.034141450.069756

930.033774460.068243940.033415圆周等分系数表

例：要在直径D=80毫米的圆周上钻孔，示两孔的中心距S=?解：查表，31等分时，系数K=0.10117所以* K =80*0.10117=8.09毫米。

470.066792950.033064 480.065403960.032719 490.064073970.032381 500.072791980.032051

990.031728

1000.03141

周上钻31个等距离的小示两孔的中心距S=?

时，系数K=0.10117所以 S=D 0.10117=8.09毫米。