两圆外切圆心轨迹

GeoGebra 命令及参数

1. Intersect(xAxis, yAxis) → A
2. Point(yAxis) → O
3. Circle(O, r_1) → c
4. PointIn(b) → C
5. Circle(C, r_2) → d
6. Line(O, C) → h
7. Intersect(c, h) → D, E
8. Intersect(d, h) → F, G
9. Midpoint(E, F) → I
10. Circle(I, F) → k
11. Midpoint(O, C) → M_3
12. OrthogonalLine(M_3, h) → p
13. Circle(O, r_1 + Δr) → q
14. Circle(C, r_2 + Δr) → r
15. Intersect(r, q) → L_2, L_1, ,
16. Segment(O, L_1) → i
17. Segment(O, L_2) → j
18. Segment(L_1, C) → l
19. Segment(L_2, C) → m
20. Intersect(d, l) → L,
21. Intersect(d, m) → N,
22. Intersect(c, i) → P,
23. Intersect(c, j) → Q,
24. Circle(L_1, P) → s
25. Circle(L_2, Q) → t
26. Midpoint(D, G) → M
27. Circle(O, R) → g
28. Circle(C, R + r_1 - r_2) → c_1
29. Intersect(g, c_1) → M_1, M_2, ,
30. Line(M_1, O) → f_1
31. Intersect(c, q, 1) → H
32. Intersect(c, q, 1) → S
33. Intersect(c, q) → T, , ,
34. Intersect(c, f_1) → U, V
35. Line(M_1, C) → g_1
36. Intersect(d, r, 1) → W
37. Intersect(d, r) → Z, , ,
38. Intersect(d, r, 1) → A_1
39. Intersect(d, r, 1) → B_1
40. Intersect(d, r, 1) → C_1
41. Intersect(d, r, 1) → D_1
42. Intersect(d, r, 1) → E_1
43. Intersect(d, r, 1) → F_1
44. Intersect(d, g_1) → G_1, H_1
45. Circle(M_1, V) → d_1
46. Circle(C, r_2) → e_1
47. Line(M_2, O) → a
48. Line(M_2, C) → i_1
49. Intersect(c, a) → B, I_1
50. Intersect(d, r, 1) → J_1
51. Intersect(d, r, 1) → K_1
52. Intersect(d, r, 1) → L_3
53. Circle(M_2, I_1) → k_1
54. Distance(M_1, H_1) → distanceM1H1
55. Distance(M_1, V) → distanceM1V
56. Circumference(c) → circumferencec
57. PointIn(c) → Pointc
58. Intersect(c_1, h, 1) → N_1
59. Circle(M, G) → p_1