三角形中的不等式动态演示

GeoGebra 命令及参数

1. Ray(A, B_1) → f
2. Rotate(B_1, (a_2 * π / 180), A) → B'
3. Angle(B_1, A, B') → α
4. Ray(A, B') → g
5. Point(g) → C
6. Point(f) → B
7. Segment(C, B) → h
8. Midpoint(h) → E
9. Midpoint(C, A) → F
10. Midpoint(B, A) → G
11. Segment(A, B) → i
12. Segment(A, C) → j
13. Min({i, h, j}) → b_1
14. Circle(A, (0.2 * b_1)) → c_2
15. Circle(C, (0.2 * b_1)) → d
16. Circle(B, (0.2 * b_1)) → e
17. Intersect(d, j, 1) → H
18. Intersect(d, h, 1) → I
19. Intersect(c_2, j, 1) → J
20. Intersect(c_2, i, 1) → K
21. Intersect(e, i, 1) → L
22. Intersect(e, h, 1) → M
23. CircleSector(A, K, J) → k
24. CircleSector(B, M, L) → p
25. CircleSector(C, H, I) → q
26. Polygon(A, B, C) → poly1, c_1, a_1, d_1
27. Rotate(K, If[0 < l ≤ 1, (l * α), α], A) → K'
28. CircleSector(A, K, K') → r
29. Dilate(B, If[1 < l ≤ 2, 2 - l, 0], C) → D'
30. Segment(B, D') → a
31. Dilate(A, If[2.5 < l ≤ 3.5, 3.5 - l, 0], E) → A'
32. Vector(A, A') → u
33. Translate(r, u) → r'
34. Angle(M, B, L) → β
35. Rotate(M, If[3.5 < l ≤ 4.5, ((l - 3.5) * β), β], B) → M'
36. CircleSector(B, M, M') → s
37. Dilate(A, If[4.5 < l ≤ 5.5, 5.5 - l, 0], C) → A'_1
38. Segment(A, A'_1) → b
39. Dilate(B, If[6 < l ≤ 7, 7 - l, 0], F) → D'_1
40. Vector(B, D'_1) → v
41. Translate(s, v) → s'
42. Rotate(H, If[7 < l ≤ 8, ((l - 7) * (π - α - β)), π - α - β], C) → H'
43. CircleSector(C, H, H') → t
44. Dilate(B, If[8 < l ≤ 9, 9 - l, 0], A) → D'_2
45. Segment(B, D'_2) → c
46. Dilate(C, If[9.5 < l ≤ 10.5, 10.5 - l, 0], G) → C'
47. Vector(C, C') → w
48. Translate(t, w) → t'
49. CircleArc(A, K, J) → e_1
50. CircleArc(B, M, L) → g_1
51. CircleArc(C, H, I) → h_1