旋转与中位线动画演示

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. Segment(A, C) → i
8. Rotate(A, α / 2, B) → A'_1
9. Angle(A, B, A'_1) → β
10. Ray(B, A'_1) → j
11. Intersect(j, i) → D
12. Segment(B, D) → k
13. Min({f, h, k}) → b
14. Circle(B, (0.25 * b)) → c
15. Intersect(c, f, 1) → E
16. Intersect(j, k) → F
17. Intersect(c, h, 1) → G
18. Intersect(c, j) → H,
19. CircleArc(B, E, H) → d
20. Point(d) → I
21. Mirror(I, j) → I'
22. Line(B, I') → l
23. Line(B, I) → m
24. Ray(B, I') → n
25. Ray(B, I) → p
26. Point(p) → J
27. Line(A, B) → q
28. OrthogonalLine(J, q) → r
29. Intersect(r, q) → K
30. Point(n) → L
31. Line(B, C) → s
32. OrthogonalLine(L, s) → t
33. Intersect(s, t) → M
34. OrthogonalLine(L, q) → e
35. Intersect(q, e) → N
36. OrthogonalLine(J, s) → f_1
37. Intersect(s, f_1) → O
38. Midpoint(J, L) → P
39. Circle(P, K) → c_1
40. Polygon(A, C, B) → poly1, b_1, a_1, c_2
41. CircleSector(B, E, I) → d_1
42. Angle(I, B, G) → γ
43. Rotate(d_1, If[0 < o ≤ 1, (o * γ), γ], B) → e_1
44. Angle(L, M, C) → δ
45. Angle(K, N, L) → ε
46. Angle(A, K, J) → ζ
47. Angle(J, O, C) → η
48. Dilate(L, If[2 < o ≤ 3, 3 - o, 0], M) → L'
49. Dilate(L, If[2 < o ≤ 3, 3 - o, 0], N) → L'_1
50. Segment(L, L') → g_1
51. Segment(L, L'_1) → h_1
52. Dilate(J, If[3 < o ≤ 4, 4 - o, 0], O) → J'
53. Dilate(J, If[3 < o ≤ 4, 4 - o, 0], K) → J'_1
54. Segment(J, J') → i_1
55. Segment(J, J'_1) → j_1
56. Dilate(J, If[4 < o ≤ 5, 5 - o, 0], P) → J'_2
57. Segment(J, J'_2) → k_1
58. Dilate(P, If[5 < o ≤ 6, 6 - o, 0], L) → P'
59. Segment(P, P') → l_1
60. Rotate(J, If[6 < o ≤ 7, ((o - 6) * π), π], P) → J'_3
61. Rotate(J'_2, If[6 < o ≤ 7, ((o - 6) * π), π], P) → Q
62. Segment(J'_3, Q) → m_1
63. Dilate(P, If[7 < o ≤ 8, 8 - o, 0], N) → P'_1
64. Segment(P, P'_1) → n_1
65. Circle(P, P'_1) → p_1