通过截取圆锥得到椭圆

GeoGebra 命令及参数

1. Point(zAxis) → A
2. Cone(A_1, A, 4) → a, a_2, a_3
3. Intersect(xAxis, a_3, 2) → B
4. Intersect(yAxis, xAxis) → C_1
5. Line(C_1, B) → f
6. Intersect(xAxis, a_3, 1) → C
7. Point(xAxis) → E_1
8. Point(xAxis) → F
9. OrthogonalLine(E_1, xOyPlane) → g
10. Point(g) → G
11. Plane(A, E_1, F) → b
12. OrthogonalLine(F, b) → h
13. Point(h) → H
14. Plane(G, F, H) → c
15. IntersectPath(c, a) → d
16. Line(G, F) → i
17. Intersect(i, d) → D, E
18. Line(A, C) → j
19. Line(A, B) → k
20. Polygon(A, E, D) → Polígon1, k_1, a_1, l
21. AngularBisector(i, j) → m, n
22. AngularBisector(k_1, l) → p, q
23. Intersect(n, q) → I_1
24. OrthogonalLine(I_1, a_1, Polígon1) → r
25. Intersect(i, r) → F_1
26. OrthogonalLine(I_1, k_1, Polígon1) → s
27. Intersect(j, s) → P_1
28. Circle(I_1, F_1, Polígon1) → e
29. Sphere(I_1, P_1) → o
30. Circle(q, P_1) → t
31. AngularBisector(i, k) → f_1, g_1
32. Intersect(q, g_1) → I_2
33. OrthogonalLine(I_2, a_1, Polígon1) → h_1
34. Intersect(h_1, i) → F_2
35. OrthogonalLine(I_2, k, Polígon1) → i_1
36. Intersect(k, i_1) → P_2
37. Circle(I_2, F_2, Polígon1) → d_1
38. Sphere(I_2, F_2) → u
39. Circle(q, P_2) → c_1
40. Point(d) → L
41. Segment(F_1, L) → j_1
42. Line(L, F_1) → n_1
43. Line(A, L) → m_1
44. Intersect(m_1, t) → T,
45. Segment(T, L) → p_1
46. Segment(L, F_2) → l_1
47. Line(L, F_2) → r_1
48. Intersect(m_1, c_1) → U,
49. Segment(L, U) → q_1