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2023年12月24日发(作者:解决河内塔问题时人们采用的策略)

三角函数角度对照表

角度

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

正弦(sin)

0.01745

0.03490

0.05234

0.06976

0.08716

0.10453

0.12187

0.13917

0.15643

0.17365

0.19081

0.20791

0.22495

0.24192

0.25882

0.27564

0.29237

0.30902

0.32557

0.34202

0.35837

0.37461

0.39073

0.40674

0.42262

0.43837

0.45399

0.46947

0.48481

0.50000

0.51504

0.52992

余弦(cos)

0.99985

0.99939

0.99863

0.99756

0.99619

0.99452

0.99255

0.99027

0.98769

0.98481

0.98163

0.97815

0.97437

0.97030

0.96593

0.96126

0.95630

0.95106

0.94552

0.93969

0.93358

0.92718

0.92050

0.91355

0.90631

0.89879

0.89101

0.88295

0.87462

0.86603

0.85717

0.84805

正切(tan)

0.01746

0.03492

0.05241

0.06993

0.08749

0.10510

0.12278

0.14054

0.15838

0.17633

0.19438

0.21256

0.23087

0.24933

0.26795

0.28675

0.30573

0.32492

0.34433

0.36397

0.38386

0.40403

0.42447

0.44523

0.46631

0.48773

0.50953

0.53171

0.55431

0.57735

0.60086

0.62487

余切(cot)

57.28996

28.63625

19.08114

14.30067

11.43005

9.51436

8.14435

7.11537

6.31375

5.67128

5.14455

4.70463

4.33148

4.01078

3.73205

3.48741

3.27085

3.07768

2.90421

2.74748

2.60509

2.47509

2.35585

2.24604

2.14451

2.05030

1.96261

1.88073

1.80405

1.73205

1.66428

1.60033

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

0.54464

0.55919

0.57358

0.58779

0.60182

0.61566

0.62932

0.64279

0.65606

0.66913

0.68200

0.69466

0.70711

0.71934

0.73135

0.74314

0.75471

0.76604

0.77715

0.78801

0.79864

0.80902

0.81915

0.82904

0.83867

0.84805

0.85717

0.86603

0.87462

0.88295

0.89101

0.89879

0.90631

0.91355

0.92050

0.83867

0.82904

0.81915

0.80902

0.79864

0.78801

0.77715

0.76604

0.75471

0.74314

0.73135

0.71934

0.70711

0.69466

0.68200

0.66913

0.65606

0.64279

0.62932

0.61566

0.60182

0.58779

0.57358

0.55919

0.54464

0.52992

0.51504

0.50000

0.48481

0.46947

0.45399

0.43837

0.42262

0.40674

0.39073

0.64941

0.67451

0.70021

0.72654

0.75355

0.78129

0.80978

0.83910

0.86929

0.90040

0.93252

0.96569

1.00000

1.03553

1.07237

1.11061

1.15037

1.19175

1.23490

1.27994

1.32704

1.37638

1.42815

1.48256

1.53986

1.60033

1.66428

1.73205

1.80405

1.88073

1.96261

2.05030

2.14451

2.24604

2.35585

1.53986

1.48256

1.42815

1.37638

1.32704

1.27994

1.23490

1.19175

1.15037

1.11061

1.07237

1.03553

1.00000

0.96569

0.93252

0.90040

0.86929

0.83910

0.80978

0.78129

0.75355

0.72654

0.70021

0.67451

0.64941

0.62487

0.60086

0.57735

0.55431

0.53171

0.50953

0.48773

0.46631

0.44523

0.42447

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

90

0.92718

0.93358

0.93969

0.94552

0.95106

0.95630

0.96126

0.96593

0.97030

0.97437

0.97815

0.98163

0.98481

0.98769

0.99027

0.99255

0.99452

0.99619

0.99756

0.99863

0.99939

0.99985

1.00000

0.37461

0.35837

0.34202

0.32557

0.30902

0.29237

0.27564

0.25882

0.24192

0.22495

0.20791

0.19081

0.17365

0.15643

0.13917

0.12187

0.10453

0.08716

0.06976

0.05234

0.03490

0.01745

0.00000

2.47509

2.60509

2.74748

2.90421

3.07768

3.27085

3.48741

3.73205

4.01078

4.33148

4.70463

5.14455

5.67128

6.31375

7.11537

8.14435

9.51436

11.43005

14.30067

19.08114

28.63625

57.28996

无效

0.40403

0.38386

0.36397

0.34433

0.32492

0.30573

0.28675

0.26795

0.24933

0.23087

0.21256

0.19438

0.17633

0.15838

0.14054

0.12278

0.10510

0.08749

0.06993

0.05241

0.03492

0.01746

无效

[例] 已知大径D=56mm,小径d=45mm,圆锥长度L=44,求圆锥半角a/2(小刀架转动角度)

[解] 公式:锥度全角tan(a)=(D-d)/L,圆锥半角tan(a/2)=(D-d)/L/2,小刀架转动角度等于大径减小径的差除以2倍长度,算出的数值查三角函数表正切值,对应的角度即为小刀架转动角度。所以圆锥半角tan(a/2)=(大径D-小径d)/圆锥长度L/2=(56-45)/44/2=0.125,查三角函数表正切,0.12278与它最接近,即为7°7′30″。这是小刀架的转动角度。还有一种近似公式也告诉你,就是圆锥半角小于6°时,可用28.7乘以锥度也行。


本文标签: 角度 转动 刀架 圆锥 大径