三角形的垂心动画

GeoGebra 命令及参数

1. Rotate(A, (a * π / 180), B) → A'
2. Angle(A, B, A') → α
3. Segment(B, A) → f
4. Ray(B, A') → g
5. Point(g) → C
6. Segment(B, C) → h
7. Circle(B, b) → c
8. Intersect(c, f, 1) → D
9. Intersect(c, h, 1) → E
10. CircleSector(B, D, E) → d
11. Segment(C, A) → i
12. Line(C, A) → j
13. Line(A, B) → k
14. OrthogonalLine(C, k) → m
15. Intersect(m, k) → H
16. Circle(C, 2) → e
17. Circle(H, 2) → p
18. Intersect(e, j, 1) → J
19. Ray(C, J) → n
20. Line(C, H) → r
21. Polygon(B, A, C) → poly1, c_1, b_1, a_1
22. Angle(C, A, B) → β
23. Midpoint(f) → I
24. Angle(A, H, C) → δ
25. Line(C, B) → l
26. OrthogonalLine(A, l) → q
27. Intersect(q, l) → F
28. Angle(B, F, A) → γ
29. Intersect(q, r) → G
30. Segment(C, H) → s
31. Line(C, H) → t
32. Circle(C, 2) → d_1
33. Circle(H, 2) → e_1
34. Intersect(d_1, t, 1) → L
35. Intersect(e_1, t) → M, N
36. Ray(C, L) → f_1
37. Ray(H, N) → g_1
38. Segment(C, H) → h_1
39. Midpoint(C, G) → O
40. Circle(B, 1) → k_1
41. Circle(A, 1) → p_1
42. Intersect(k_1, k, 2) → P
43. Intersect(p_1, k, 1) → Q
44. Ray(B, P) → i_1
45. Ray(A, Q) → j_1
46. Dilate(B, If[0 < o ≤ 1, 1 - o, 0], I) → B'
47. Segment(B, B') → l_1
48. Rotate(B, If[1 < o ≤ 2, ((-(o - 1)) * π), (-π)], I) → B'_1
49. Rotate(B', If[1 < o ≤ 2, ((-(o - 1)) * π), (-π)], I) → B''
50. Segment(B'_1, B'') → m_1
51. Intersect(k_1, l, 2) → K
52. Circle(C, 2) → q_1
53. Intersect(q_1, l, 1) → R
54. Segment(B, C) → n_1
55. Ray(C, R) → r_1
56. Ray(B, K) → s_1
57. Dilate(A, If[2 < o ≤ 3, 3 - o, 0], F) → A'_1
58. Segment(A, A'_1) → t_1
59. Dilate(C, If[3 < o ≤ 4, 4 - o, 0], O) → C'
60. Segment(C, C') → f_2
61. Dilate(O, If[4 < o ≤ 5, 5 - o, 0], G) → O'
62. Segment(O, O') → g_2
63. Dilate(G, If[5 < o ≤ 6, 6 - o, 0], H) → G'
64. Segment(G, G') → h_2
65. Rotate(C, If[6 < o ≤ 7, ((-(o - 6)) * π), (-π)], O) → C'_1
66. Rotate(C', If[6 < o ≤ 7, ((-(o - 6)) * π), (-π)], O) → C''
67. Segment(C'_1, C'') → i_2
68. Angle(I, F, O) → ε
69. Dilate(I, If[8 < o ≤ 9, 9 - o, 0], F) → I'
70. Dilate(O, If[8 < o ≤ 9, 9 - o, 0], F) → O'_1
71. Segment(I, I') → j_2
72. Segment(O, O'_1) → k_2
73. Line(A, F) → l_2
74. Line(C, B) → m_2