平行四边形动画演示

GeoGebra 命令及参数

1. Ray(A, B) → f
2. Rotate(B, a°, A) → B'
3. Ray(A, B') → g
4. Line(B, g) → h
5. Point(g) → C
6. Line(C, f) → i
7. Intersect(h, i) → D
8. Segment(C, D) → g_3
9. Line(A, D) → t_1
10. Segment(A, C) → f_3
11. Angle(B, A, B') → α
12. Segment(C, D) → j
13. Segment(A, B) → k
14. Segment(B, D) → l
15. Segment(A, C) → m
16. Min(m, k) → b
17. Circle(C, (0.2 * b)) → d
18. Circle(A, (0.2 * b)) → e
19. Circle(B, (0.2 * b)) → p
20. Circle(D, (0.2 * b)) → c
21. Intersect(e, k, 1) → E
22. Intersect(e, m, 1) → F
23. Intersect(p, k, 1) → G
24. Intersect(p, l, 1) → H
25. Intersect(d, g, 2) → I
26. Ray(C, I) → q
27. Intersect(c, h, 2) → J
28. Ray(D, J) → r
29. Intersect(c, i, 2) → K
30. Ray(D, K) → s
31. Dilate(A, If[0 < o ≤ 1, 1 - o, 0], B) → A'
32. Segment(A, A') → t
33. Rotate(E, If[1 < o ≤ 2, ((o - 1) * α), α], A) → E'
34. CircleSector(A, E, E') → c_1
35. Dilate(A, If[2 < o ≤ 3, 3 - o, 0], C) → A'_1
36. Vector(A, A'_1) → u
37. Translate(c_1, u) → d_1
38. Segment(A, A'_1) → f_1
39. Dilate(C, If[3 < o ≤ 4, 4 - o, 0], D) → C'
40. Vector(C, C') → v
41. Translate(d_1, v) → e_1
42. Segment(C, C') → g_1
43. Dilate(D, If[4 < o ≤ 5, 5 - o, 0], B) → D'
44. Segment(D, D') → h_1
45. Polygon(A, B, D, C) → poly1, a_1, b_1, d_2, c_2
46. Dilate(A, If[5.5 < o ≤ 6.5, 6.5 - o, 0], C) → A'_2
47. Vector(A, A'_2) → w
48. Translate(A, w) → A'_3
49. Translate(A', w) → A''
50. Dilate(A, If[6.5 < o ≤ 7.5, 7.5 - o, 0], B) → A'_4
51. Vector(A, A'_4) → u_1
52. Translate(A, u_1) → A'_5
53. Translate(A'_1, u_1) → L
54. Rotate(D, If[6 < o ≤ 7, ((-(o - 6)) * π / 3), ((-π)) / 3], B) → D'_2
55. Rotate(D', If[6 < o ≤ 7, ((-(o - 6)) * π / 3), ((-π)) / 3], B) → D''
56. Rotate(C, If[6 < o ≤ 7, ((-(o - 6)) * π / 3), ((-π)) / 3], D) → C'_2
57. Rotate(C', If[6 < o ≤ 7, ((-(o - 6)) * π / 3), ((-π)) / 3], D) → C''
58. Rotate(A, If[6 < o ≤ 7, ((-(o - 6)) * π / 3), ((-π)) / 3], C) → A'_7
59. Rotate(A'_1, If[6 < o ≤ 7, ((-(o - 6)) * π / 3), ((-π)) / 3], C) → M
60. Rotate(A, If[6 < o ≤ 7, ((-(o - 6)) * π / 3), ((-π)) / 3], A) → A'_8
61. Rotate(A', If[6 < o ≤ 7, ((-(o - 6)) * π / 3), ((-π)) / 3], A) → A''_1
62. Rotate(D, If[7 < o ≤ 8, ((o - 7) * π / 3), π / 3], D) → D'_3
63. Rotate(D', If[7 < o ≤ 8, ((o - 7) * π / 3), π / 3], D) → D''_1
64. Rotate(C, If[7 < o ≤ 8, ((o - 7) * π / 3), π / 3], C) → C'_3
65. Rotate(C', If[7 < o ≤ 8, ((o - 7) * π / 3), π / 3], C) → C''_1
66. Rotate(A, If[7 < o ≤ 8, ((o - 7) * π / 3), π / 3], A) → A'_9
67. Rotate(A'_1, If[7 < o ≤ 8, ((o - 7) * π / 3), π / 3], A) → N
68. Rotate(A, If[7 < o ≤ 8, ((o - 7) * π / 3), π / 3], B) → A'_{10}
69. Rotate(A', If[7 < o ≤ 8, ((o - 7) * π / 3), π / 3], B) → A''_2
70. Line(A, D) → s_2
71. Midpoint(A, D) → Q
72. Rotate(A, If[16 < o ≤ 17, ((o - 16) * π), π], Q) → A'_{11}
73. Midpoint(A, C) → O
74. Dilate(A, If[6 < o ≤ 7, 7 - o, 0], O) → A'_6
75. Segment(A, A'_6) → i_1
76. Rotate(A, If[7 < o ≤ 8, ((o - 7) * π), π], O) → A'_{12}
77. Rotate(A'_6, If[7 < o ≤ 8, ((o - 7) * π), π], O) → P
78. Segment(A'_{12}, P) → j_1
79. Line(A, D) → k_1
80. OrthogonalLine(B, k_1) → l_1
81. Line(O, D) → m_1
82. OrthogonalLine(B, m_1) → n_1
83. Intersect(m_1, n_1) → R
84. Dilate(O, If[8 < o ≤ 9, 9 - o, 0], D) → O'
85. Segment(O, O') → p_1
86. Dilate(B, If[9 < o ≤ 10, 10 - o, 0], R) → B'_1
87. Segment(B, B'_1) → q_1
88. Angle(B, R, D) → β
89. Dilate(A, If[10 < o ≤ 11, 11 - o, 0], R) → A'_{13}
90. Segment(A, A'_{13}) → r_1
91. Angle(B, A, R) → γ
92. Rotate(A, If[11.5 < o ≤ 12.5, ((-(o - 11.5)) * γ), (-γ)], A) → A'_{14}
93. Rotate(A'_{13}, If[11.5 < o ≤ 12.5, ((-(o - 11.5)) * γ), (-γ)], A) → S
94. Segment(A'_{14}, S) → s_1
95. Line(O, D) → f_2
96. Circle(D, 2) → e_2
97. Circle(O, 2) → g_2
98. Intersect(e_2, f_2, 2) → T
99. Intersect(g_2, f_2, 1) → U
100. Ray(D, T) → h_2
101. Ray(O, U) → i_2
102. Polygon(R, B, D, C, A) → poly2, r_2, b_2, d_3, c_3, a_2
103. Polygon(R, B, A) → poly3, a_3, r_3, b_3