圆锥曲线截面

GeoGebra 命令及参数

1. Circle(V', A, xOyPlane) → e
2. Intersect(xAxis, e, 2) → B
3. Rotate(B, α, V') → B'
4. Angle(B, V', B', xOyPlane) → β
5. OrthogonalLine(B', xOyPlane) → f
6. Line(V', B') → g
7. Line(D, g) → h_1
8. Plane(h_1, f) → i
9. OrthogonalLine(V', g, i) → j
10. Intersect(h_1, j) → C_1
11. Rotate(C_1, γ, D, i) → C'
12. Angle(C_1, D, C', i) → δ
13. Line(D, C') → l
14. Intersect(g, l) → E
15. OrthogonalLine(E, i) → m
16. OrthogonalLine(C', i) → n
17. Plane(l, n) → p
18. OrthogonalLine(V, p) → q
19. Intersect(q, p) → F
20. Plane(E, F, V) → r
21. Line(E, F) → s
22. IntersectPath(p, d) → t
23. Intersect(g, c_1, 2) → V_2
24. Intersect(g, c_1, 1) → V_1
25. Plane(xAxis, zAxis) → o
26. OrthogonalLine(V, o) → f_1
27. PointIn(o) → C_2
28. Circle(f_1, C_2) → e_1
29. Intersect(c_1, yAxis, 1) → G
30. Line(V, G) → g_1
31. IntersectPath(o, d) → k_1
32. Intersect(k_1, e_1, 3) → H
33. Line(V, H) → i_1
34. Midpoint(V_2, G) → C
35. If(u ≟ 0, v ≟ 0) → w
36. If(u ≟ 0, v ≟ 0) → a_1
37. If(u ≟ 0, v ≟ 0) → b_1
38. If(u ≟ 0, v ≟ 0) → d_1
39. If(u ≟ false, v ≟ false) → j_1
40. If(u ≟ false, v ≟ false) → l_1
41. If(u ≟ false, v ≟ false) → m_1
42. If(u ≟ false, v ≟ false) → n_1
43. If(u ≟ false, v ≟ false) → o_1
44. If(u ≟ false, v ≟ false) → p_1
45. If(u ≟ false, v ≟ false) → q_1
46. If(u ≟ false, v ≟ false) → r_1
47. If(u ≟ false, v ≟ false) → s_1
48. If(u ≟ false, v ≟ false) → t_1
49. If(u ≟ false, v ≟ false) → u_1
50. If(u ≟ false, v ≟ false) → v_1
51. If(u ≟ false, v ≟ false) → w_1
52. If(u ≟ false, v ≟ false) → a_2
53. If(u ≟ false, v ≟ false) → b_2
54. If(u ≟ false, v ≟ false) → c_2
55. Midpoint(G, V_2) → C_t
56. Line(V, V_2) → f_2