Venn图的阴影区域

GeoGebra 命令及参数

1. Polygon(A, B, C, D) → poly1, a, b, c_2, d
2. Circle(E, 2) → e
3. Circle(F, 2) → f
4. Intersect(a, d) → G
5. Intersect(c_2, d) → H
6. Polygon(G, H, I, J) → poly2, g, h, i, j
7. Circle(E, 2) → p
8. Circle(F, 2) → q
9. Circle(E, 2) → r
10. Circle(F, 2) → s
11. Intersect(e, f, 1) → K
12. Intersect(e, f, 2) → L
13. CircleArc(E, L, K) → t
14. CircleArc(F, K, L) → c
15. Point({c, t}) → Mit1
16. Locus(Mi1, Mit1) → loc1
17. CircleArc(E, K, L) → c_1
18. Point({c_1, c}) → Mit2
19. Locus(Mi2, Mit2) → loc2
20. CircleArc(F, L, K) → d_1
21. Point({d_1, t}) → Mit3
22. Locus(Mi3, Mit3) → loc4
23. Intersect(a, d) → M
24. Intersect(c_2, d) → N
25. Polygon(M, N, O, P) → poly3, m_1, n_1, o_1, p_1
26. Intersect(a, d) → Q
27. Intersect(c_2, d) → R
28. Intersect(b, c_2) → S
29. Intersect(a, b) → T
30. Polygon(Q, R, S, T) → poly4, q_1, r_1, s_1, t_1