韦恩图着色演示（2-3集）

GeoGebra 命令及参数

1. Polygon(A, B, D, C) → poly1, a, b, d, c
2. Circle(E, G) → e
3. Circle(F, H) → f
4. Segment(A, B) → g
5. Segment(B, D) → h
6. Segment(D, C) → i
7. Segment(C, A) → j
8. Intersect(e, f) → I, J, ,
9. CircleArc(E, I, J) → k
10. CircleArc(E, J, I) → p
11. CircleArc(F, I, J) → q
12. CircleArc(E, J, I) → t
13. CircleArc(F, I, J) → c_1
14. CircleArc(E, I, J) → r
15. CircleArc(F, J, I) → d_1
16. CircleArc(E, J, I) → e_1
17. CircleArc(F, I, J) → f_1
18. Polygon(A, C, D, B) → poly2, a_2, c_2, d_2, b_1
19. Circle(E, G) → g_1
20. Circle(F, H) → h_1
21. Random(1, 8) → i_2
22. Polygon(K, L, 3) → poly3, p_1, q_1, r_1, M
23. Circle(M, m_1) → k_2
24. Circle(K, m_1) → p_2
25. Circle(L, m_1) → q_2
26. Intersect(k_2, p_2, 2) → N
27. Intersect(k_2, p_2, 1) → O
28. Intersect(p_2, q_2, 1) → P
29. Intersect(k_2, q_2, 2) → Q
30. Intersect(k_2, q_2, 1) → R
31. Intersect(p_2, q_2, 2) → S
32. CircleArc(K, O, N) → r_2
33. CircleArc(M, N, O) → s_2
34. CircleArc(L, R, Q) → t_2
35. CircleArc(M, Q, R) → c_3
36. CircleArc(L, P, S) → d_3
37. CircleArc(K, S, P) → e_3
38. Polygon(A, C, D, B) → poly4, a_3, c_4, d_4, b_3
39. Circle(M, m_1) → g_3
40. Circle(K, m_1) → h_3
41. Circle(L, m_1) → k_3
42. Random(1, 28) → f_3