抛物线活动 by PJ Yim

GeoGebra 命令及参数

1. Point(directrix) → B
2. Point(directrix) → C
3. Point(directrix) → F
4. Point(directrix) → G
5. Point(directrix) → J
6. Point(directrix) → K
7. Point(directrix) → L
8. Point(directrix) → M
9. Point(directrix) → N
10. Point(directrix) → O
11. OrthogonalLine(N, directrix) → j
12. OrthogonalLine(M, directrix) → k
13. OrthogonalLine(L, directrix) → l
14. OrthogonalLine(K, directrix) → m
15. OrthogonalLine(J, directrix) → p
16. OrthogonalLine(B, directrix) → q
17. OrthogonalLine(C, directrix) → s
18. OrthogonalLine(F, directrix) → b
19. OrthogonalLine(G, directrix) → c
20. LineBisector(Focus, K) → r
21. Intersect(m, r) → Q
22. LineBisector(J, Focus) → n
23. Intersect(p, n) → R
24. LineBisector(Focus, L) → d
25. Intersect(l, d) → S
26. LineBisector(Focus, M) → e
27. Intersect(k, e) → T
28. LineBisector(Focus, N) → f_1
29. Intersect(j, f_1) → U
30. OrthogonalLine(Focus, directrix) → f
31. Intersect(directrix, f_1) → A
32. LineBisector(Focus, A) → g
33. Intersect(f, g) → H
34. LineBisector(Focus, C) → h
35. Intersect(s, h) → I
36. LineBisector(B, Focus) → i
37. Intersect(q, i) → P
38. OrthogonalLine(O, directrix) → g_1
39. LineBisector(O, Focus) → h_1
40. Intersect(g_1, h_1) → V
41. LineBisector(Focus, F) → a
42. Intersect(b, a) → E
43. LineBisector(G, Focus) → i_1
44. Intersect(c, i_1) → W
45. Point(directrix) → D
46. Point(directrix) → Z
47. Point(directrix) → A_1
48. OrthogonalLine(D, directrix) → t
49. OrthogonalLine(Z, directrix) → j_1
50. OrthogonalLine(A_1, directrix) → k_1
51. LineBisector(D, Focus) → l_1
52. Intersect(t, l_1) → B_1
53. LineBisector(Z, Focus) → m_1
54. Intersect(j_1, m_1) → C_1
55. LineBisector(Focus, A_1) → n_1
56. Intersect(k_1, n_1) → D_1