平行线中的角 by Jonathan Robinson

GeoGebra 命令及参数

1. Segment(A, B) → a
2. Segment(C, D) → b
3. Segment(E, F) → c
4. Intersect(b, c) → G
5. Intersect(a, c) → H
6. Angle(b, c) → α
7. Segment(I_1, J_1) → d_1
8. Segment(K_1, L_1) → e_1
9. Segment(M_1, N_1) → f_1
10. Intersect(d_1, f_1) → O_1
11. Intersect(e_1, f_1) → P_1
12. Point(b) → U
13. Intersect(b, c) → V
14. Point(a) → W
15. Point(a) → A_1
16. Point(b) → B_1
17. Point(d_1) → C_1
18. Point(d_1) → D_1
19. Point(d_1) → E_1
20. Point(e_1) → F_1
21. Intersect(e_1, f_1) → G_1
22. Point(e_1) → H_1
23. Intersect(a, c) → Z
24. Angle(A_1, Z, F) → β
25. Intersect(d_1, f_1) → W_1
26. Point(d_1) → Z_1
27. Point(d_1) → A_2
28. Point(e_1) → B_2
29. Intersect(e_1, f_1) → C_2
30. Point(e_1) → D_2
31. Intersect(b, c) → E_2
32. Intersect(a, c) → F_2
33. Intersect(e_1, f_1) → G_2
34. Point(b) → K_2
35. Point(a) → L_2
36. Point(b) → M_2
37. Point(a) → N_2
38. Point(d_1) → O_2
39. Point(e_1) → P_2
40. Point(e_1) → Q_2
41. Point(d_1) → R_2
42. Intersect(d_1, f_1) → H_2
43. Angle(O_2, H_2, G_2) → γ
44. Angle(Q_2, G_2, H_2) → δ
45. Segment(M_3, N_3) → d_2
46. Segment(O_3, P_3) → e_2
47. Segment(Q_1, R_1) → f_2
48. Intersect(d_2, f_2) → S_2
49. Intersect(e_2, f_2) → T_1
50. Intersect(d_2, f_2) → Q_3
51. Point(d_2) → R_3
52. Intersect(e_2, f_2) → S_3
53. Point(e_2) → T_2
54. Point(e_2) → U_1
55. Point(d_2) → V_2
56. Intersect(d_2, f_2) → I_2
57. Intersect(e_2, f_2) → J_2
58. Point(d_2) → S_1
59. Point(d_2) → T_3
60. Point(e_2) → U_2
61. Point(e_2) → V_1
62. Angle(J_2, I_2, S_1) → η_1
63. Angle(V_1, J_2, I_2) → ε_1