维恩图的几何构造：用圆交叠表示集合关系

GeoGebra 命令及参数

1. Circle(A, B) → c
2. Circle(B, A) → d
3. Segment(A, B) → f
4. Circle(A, f + 0.7) → e
5. Circle(B, f + 0.7) → g
6. OrthogonalLine(A, f) → h
7. Intersect(e, h) → C, D
8. Intersect(c, d) → E, F, ,
9. Tangent(C, e) → j,
10. Line(A, B) → k
11. Intersect(e, k) → G, H
12. Intersect(g, k) → I, J
13. OrthogonalLine(G, f) → l
14. OrthogonalLine(J, k) → m_2
15. Intersect(j, l) → M
16. Intersect(m_2, j) → N
17. CircleSector(B, E, F) → p
18. CircleSector(A, F, E) → q
19. Polygon(A, B, 3) → poly1, i, n, r, K
20. Circle(E, A) → s
21. Circle(E, f + 0.7) → t
22. Line(F, E) → b
23. Intersect(t, b) → L, O
24. Tangent(O, t) → f_1,
25. Intersect(l, f_1) → P
26. Intersect(m_2, f_1) → Q
27. Polygon(M, N, Q, P) → q1, m_1, n_1, q_1, p_1
28. Intersect(c, d, 1) → R
29. Midpoint(E, Q) → S
30. Midpoint(S, Q) → T
31. Midpoint(M, A) → U
32. Midpoint(M, U) → V
33. Midpoint(B, N) → W
34. Midpoint(W, N) → Z
35. Intersect(c, s) → A_1, B_1, ,
36. Intersect(d, s) → C_1, D_1, ,
37. CircleSector(A, B, A_1) → c_1
38. CircleSector(E, A_1, B) → d_1
39. CircleSector(B, D_1, A) → e_1
40. CircleSector(E, A, D_1) → g_1
41. CircleSector(B, E, A) → h_1
42. CircleSector(E, A, B) → k_1
43. CircleSector(A, B, E) → r_1
44. Circle(A, B) → s_1
45. Circle(B, A) → t_1
46. Circle(E, B) → c_2
47. Segment(M, N) → i_1
48. Segment(Q, N) → j_1
49. Segment(Q, P) → l_1
50. Segment(P, M) → a_1
51. Center(h_1) → E_1
52. Center(h_1) → F_1
53. Center(h_1) → G_1
54. Midpoint(E, L) → H_1
55. Midpoint(H_1, D_1) → I_1
56. Midpoint(H_1, A_1) → J_1
57. Midpoint(E, O) → K_1
58. Midpoint(A, U) → L_1
59. Midpoint(W, B) → M_1
60. Midpoint(H, T) → N_1
61. Midpoint(i_1) → m