长方体截面演示 by Nicolas ERDRICH

GeoGebra 命令及参数

1. Sequence(Mat * Element[cube, k], k, 1, 8) → cube'
2. Element(Element[AE, 3], 1) → droite
3. Sequence(I + (Element[cube', k, 1, 1], Element[cube', k, 2, 1]), k, 1, 8) → listepoints
4. Point(listepoints) → C
5. Element(AB, 3, 1) → avant
6. Element(AC, 3, 1) → dessus
7. Point(listepoints) → J
8. Point(listepoints) → K
9. Point(listepoints) → L
10. Polygon(J, K, L, C) → poly7, j_2, k_1, l_1, c_5
11. Point(listepoints) → M
12. Point(listepoints) → N
13. Polygon(J, M, N, K) → poly8, j_3, m_1, n_1, k_2
14. Point(listepoints) → Q
15. Polygon(K, L, Q, N) → poly9, k_3, l_2, q_1, n_2
16. Point(listepoints) → A
17. Polygon(J, C, A, M) → poly1, j, c, a_1, m
18. Polygon(Q, A, C, L) → poly2, q, a_2, c_1, l
19. Polygon(A, Q, N, M) → poly3, a_3, q_2, n, m_2
20. Segment(A, M) → a'_1
21. Segment(J, C) → j'_1
22. Segment(K, L) → k'_3
23. Segment(L, Q) → l'_2
24. Segment(M, J) → m'
25. Segment(N, K) → n'_2
26. Segment(Q, N) → q'_1
27. Segment(M, N) → m'_1
28. Segment(Q, A) → q'
29. Segment(K, J) → j'
30. Segment(N, K) → l'
31. Segment(C, L) → l''
32. Segment(C, A) → l''''
33. Segment(M, N) → k''''
34. Segment(C, A) → k'''
35. Point(j_3) → B
36. Point(l_1) → D
37. Point(n_1) → E
38. Intersect(l_1, k_1) → F
39. Intersect(c_5, l_1) → G
40. Line(F, G) → d
41. Segment(B, E) → e
42. Line(D, e) → f
43. Intersect(f, c) → H
44. Segment(H, D) → g
45. Segment(B, H) → h
46. Line(E, h) → i
47. Intersect(d, i) → O
48. Intersect(i, k_1) → R
49. Segment(R, D) → k
50. Segment(E, R) → p
51. Line(D, e) → r
52. Intersect(r, l'_2) → S
53. Segment(E, S) → s
54. Line(B, s) → t
55. Intersect(t, c_5) → T
56. Segment(T, D) → b_1
57. Segment(B, T) → d_1
58. Segment(D, S) → e_1
59. Polygon(B, E, S, D, T) → poly4, b_2, e_2, s_1, d_2, t_1
60. Polygon(B, E, R, D, H) → poly5, b_3, e_3, r_1, d_3, h_1