三维线段与变换演示

GeoGebra 命令及参数

1. Segment(A, B) → f
2. Segment(A, C) → g
3. Segment(B, C) → h
4. Dilate(B, 1 / 4, A) → B'
5. Dilate(C, 1 / 4, B) → C'
6. Dilate(A, 1 / 4, C) → A'
7. Segment(A, C') → i
8. Segment(C, B') → j
9. Segment(B, A') → k
10. Intersect(i, j) → D
11. Intersect(i, k) → E
12. Intersect(j, k) → F
13. Polygon(D, E, F) → t1, f_1, d, e
14. Polygon(A, B, C) → t2, c, a, b
15. Midpoint(D, E) → G
16. Midpoint(E, F) → H
17. Midpoint(D, F) → I
18. Segment(G, I) → l
19. Segment(I, H) → m
20. Segment(H, G) → n
21. Line(G, I) → p
22. Line(I, H) → q
23. Line(H, G) → r
24. Intersect(p, b) → J
25. Intersect(q, a) → K
26. Intersect(r, c) → L
27. Polygon(A, L, G) → t3, g_1, a_1, l_1
28. Rotate(A, (-(180°)), L) → A'_1
29. Rotate(L, (-(180°)), L) → L'
30. Rotate(G, (-(180°)), L) → G'
31. Polygon(A'_1, L', G') → t3', g', a'_1, l'
32. Midpoint(l') → M
33. Segment(G, M) → s
34. Segment(M, E) → t
35. Segment(B, E) → h_1
36. Segment(I, J) → i_1
37. Segment(I, C) → j_1
38. Polygon(J, I, C) → t4, c_1, j_2, i_2
39. Rotate(J, 180°, J) → J'
40. Rotate(I, 180°, J) → I'
41. Rotate(C, 180°, J) → C'_1
42. Polygon(J', I', C'_1) → t4', c'_1, j', i'
43. Midpoint(A, I') → N
44. Segment(D, N) → k_1
45. Segment(I, N) → m_1
46. Segment(H, K) → n_1
47. Polygon(B, H, K) → t5, k_2, b_1, h_2
48. Rotate(B, (-(180°)), K) → B'_1
49. Rotate(H, (-(180°)), K) → H'
50. Rotate(K, (-(180°)), K) → K'
51. Polygon(B'_1, H', K') → t5', k', b'_1, h'
52. Midpoint(k') → O
53. Segment(F, O) → p_1
54. Segment(O, H) → q_1
55. Intersect(f_1, l) → P
56. Polygon(P, G', B, E) → q1, p_2, r_1, b_2, e_1
57. Intersect(e, l) → Q
58. Polygon(A, D, Q, I') → q2, a_2, d_1, q_2, s_1
59. Intersect(d, m) → R
60. Polygon(R, F, C, H') → q3, r_2, f_2, c_2, t_1