三角形中位线性质演示

GeoGebra 命令及参数

1. Segment(A, B) → a
2. Segment(B, C) → b
3. Segment(C, A) → c
4. Midpoint(c) → D
5. Midpoint(b) → E
6. Segment(A, D) → d
7. Segment(D, C) → e
8. Segment(C, E) → f
9. Segment(E, B) → g
10. Segment(D, E) → q
11. Slope(q) → h
12. Slope(a) → i
13. Length(q) → j
14. Length(a) → k
15. FractionText(h) → text4
16. Segment(A_1, B_1) → a_1
17. Segment(B_1, C_1) → b_1
18. Segment(C_1, A_1) → c_1
19. Midpoint(c_1) → D_1
20. Midpoint(b_1) → E_1
21. Segment(A_1, D_1) → d_1
22. Segment(D_1, C_1) → e_1
23. Segment(C_1, E_1) → f_1
24. Segment(E_1, B_1) → g_1
25. Segment(D_1, E_1) → Midsegment_1
26. Slope(Midsegment_1) → h_1
27. Length(Midsegment_1) → j_1
28. FractionText(h_1) → text4_1
29. Slope(a) → l
30. FractionText(Slope[q]) → text5
31. FractionText(Slope[a]) → text6
32. Midpoint(a) → F
33. Segment(E, F) → n
34. Segment(F, D) → p
35. Circle(D, 1) → t
36. Circle(A, 1) → k_1
37. Intersect(t, p, 1) → J
38. Intersect(k_1, a, 1) → K
39. Intersect(t, q, 1) → O
40. Dilate(D, If[0 ≤ m < 1, 1 - m, 0], A) → D'
41. Vector(D, D') → u
42. Dilate(D, If[1 ≤ m < 2, 2 - m, 0], A) → D'_1
43. Vector(D, D'_1) → v
44. Translate(D, v) → D'_2
45. Translate(E, v) → E'
46. Segment(D'_2, E') → q'
47. Dilate(D, If[2 < m < 3, 3 - m, 0], F) → D'_3
48. Vector(D, D'_3) → w
49. Translate(D, w) → D'_4
50. Translate(E, w) → E'_1
51. Segment(D'_4, E'_1) → q'_1
52. Segment(C, E) → r
53. Segment(E, B) → s
54. Segment(C, D) → i_1
55. Segment(D, A) → l_1
56. Circle(D, 1) → p_1
57. Circle(A, 1) → q_1
58. Intersect(q_1, a, 1) → G
59. Intersect(q_1, l_1, 1) → H
60. Intersect(p_1, q, 1) → I
61. Intersect(p_1, i_1, 1) → L
62. CircleSector(D, I, L) → r_1
63. Dilate(D, If[0 ≤ m < 1, 1 - m, 0], A) → D'_5
64. Vector(D, D'_5) → u_1
65. Translate(r_1, u_1) → s_1
66. Angle(E, D, C) → α
67. CircleSector(D, L, O) → t_1
68. Translate(t_1, u_1) → c_2