圆锥曲线、离心率与准线

GeoGebra 命令及参数

1. Line(C, D) → f
2. Parabola(F, f) → c
3. Point(c) → P
4. OrthogonalLine(F, f) → g
5. Intersect(c, g) → G,
6. Mirror(G, f) → G'
7. Point(g) → F_1
8. Ellipse(F_1, F, G) → d
9. Point(d) → E
10. Midpoint(F, C) → L
11. Midpoint(L, C) → M_1
12. Midpoint(L, M_1) → N
13. Hyperbola(G, G', N) → r
14. Point(r) → Q
15. Midpoint(F_1, F) → H_1
16. Intersect(g, f) → I
17. Ellipse(F, H_1, G) → e
18. Midpoint(H_1, F) → J
19. Midpoint(H_1, J) → K
20. Ellipse(F, K, G) → k
21. Hyperbola(G, G', I) → h
22. Hyperbola(G, G', L) → p
23. Hyperbola(G, G', M_1) → q
24. Midpoint(C, M_1) → O
25. Hyperbola(G, G', O) → s
26. Point(c) → A
27. Point(s) → B
28. If(a ≟ 1, E, If[a ≟ 2, P, Q]) → M
29. Segment(F, M) → i
30. Line(M, g) → j
31. Intersect(j, f) → H
32. Segment(M, H) → l
33. Segment(P, F) → m
34. Segment(P, H) → n