平行线的坐标几何演示

GeoGebra 命令及参数

1. Rotate(B, (a * π / 180), A) → B'
2. Angle(B, A, B') → α
3. Ray(A, B') → g
4. Line(A, B') → h
5. Point(h) → C
6. Ray(B', C) → i
7. Point(i) → D
8. Line(E, h) → j
9. Circle(D, b) → c
10. Intersect(c, k, 2) → F
11. Intersect(h, l) → G
12. Segment(G, F) → m
13. Segment(F, D) → n
14. Min(m, n) → d
15. Circle(F, (0.3 * d)) → e
16. Intersect(e, k, 2) → H
17. Intersect(e, m, 1) → I
18. CircleSector(F, H, I) → p
19. Polygon(D, F, G) → poly1, g_1, d_1, f_1
20. CircleSector(F, I, H) → q
21. Ray(F, H) → t
22. Dilate(G, If[0 < o ≤ 1, 1 - o, 0], F) → G'
23. Segment(G, G') → r
24. Dilate(F, If[1 < o ≤ 2, 2 - o, 0], D) → F'
25. Segment(F, F') → s
26. Rotate(p, If[2 < o ≤ 3, ((o - 2) * π / 2), π / 2], F) → p'
27. Rotate(q, If[2 < o ≤ 3, ((-(o - 2)) * π / 2), ((-π)) / 2], F) → q'
28. Dilate(D, If[3 < o ≤ 4, 4 - o, 0], E) → D'
29. Vector(D, D') → u
30. Translate(D, u) → D'_1
31. Translate(F, u) → F'_1
32. Translate(G, u) → G'_1
33. Polygon(D'_1, F'_1, G'_1) → poly1', g'_1, d'_1, f'_1
34. Translate(G, u) → G'_2
35. Translate(G', u) → G''
36. Segment(G'_2, G'') → r'
37. Translate(F, u) → F'_2
38. Translate(F', u) → F''
39. Segment(F'_2, F'') → s'
40. Translate(p', u) → p''
41. Segment(D'_1, G'_1) → h_1
42. Translate(q', u) → q''