平行四边形的性质（动态演示）

GeoGebra 命令及参数

1. Segment(A, B) → f
2. Segment(A, C) → g
3. Line(C, f) → h
4. Line(B, g) → i
5. Intersect(h, i) → D
6. Intersect(h, i) → E
7. Segment(C, E) → j
8. Segment(B, E) → k
9. Angle(C, A, B) → α
10. Angle(A, B, E) → β
11. Angle(B, E, C) → γ
12. Angle(E, C, A) → δ
13. Segment(A, B) → l
14. Segment(B, E) → m
15. Segment(E, C) → n
16. Segment(C, A) → p
17. Segment(A, E) → q
18. Segment(C, B) → r
19. Midpoint(r) → F
20. Midpoint(q) → G
21. Segment(C, G) → s
22. Segment(G, B) → t
23. Segment(A, G) → f_1
24. Segment(G, E) → g_1
25. Circle(H, j) → c_1
26. Line(H, j) → h_1
27. Line(H, g) → i_1
28. Circle(H, g) → d_1
29. Intersect(d_1, i_1) → I, J
30. Intersect(c_1, h_1) → K, L
31. Segment(H, I) → j_1
32. Segment(I, L) → k_1
33. Segment(H, L) → l_1
34. Circle(I, l_1) → e_1
35. Line(I, l_1) → m_1
36. Intersect(e_1, m_1, 2) → M
37. Segment(L, M) → n_1
38. Segment(I, M) → p_1
39. Segment(I, M) → q_1
40. Segment(M, L) → r_1
41. Segment(L, H) → s_1
42. Segment(H, I) → t_1
43. Angle(M, I, L) → κ
44. Angle(H, L, I) → λ
45. Segment(I, L) → b_1
46. Angle(H, I, L) → μ
47. Angle(M, L, I) → ν
48. Segment(L, H) → f_2
49. Segment(H, I) → g_2
50. Segment(I, M) → h_2
51. Segment(M, L) → i_2
52. Segment(N, O) → j_2
53. Line(P, j_2) → k_2
54. Point(k_2) → Q
55. Segment(P, Q) → l_2
56. Segment(R, S) → m_2