抛物线：焦点与准线的等距点

GeoGebra 命令及参数

1. Point(b) → Focus
2. Intersect(a, c) → B
3. Point(c) → C
4. Intersect(a, d) → D
5. Point(d) → E
6. Intersect(a, e) → F
7. Point(e) → G
8. Point(f) → H
9. Intersect(a, f) → I
10. Intersect(a, g) → J
11. Point(g) → K
12. Intersect(a, h) → L
13. Point(h) → M
14. Ray(L, M) → i
15. Ray(J, K) → j
16. Ray(I, H) → k
17. Ray(B, C) → l
18. Ray(D, E) → m
19. Ray(F, G) → n
20. Intersect(a, b) → N
21. Point(b) → O
22. Ray(N, O) → p
23. Segment(Focus, O) → q
24. Segment(Focus, C) → s
25. Segment(C, B) → t
26. Segment(Focus, E) → a_1
27. Segment(E, D) → b_1
28. Segment(Focus, G) → c_1
29. Segment(G, F) → d_1
30. Segment(Focus, H) → e_1
31. Segment(H, I) → f_1
32. Segment(Focus, K) → g_1
33. Segment(K, J) → h_1
34. Segment(Focus, M) → i_1
35. Segment(M, L) → j_1
36. Segment(O, N) → r