焦点-准线性质演示

GeoGebra 命令及参数

1. Point(zAxis) → A
2. Line(A, B) → f
3. Vector(A, A + (10 * (B - A))) → u
4. InfiniteCone(A, u, (π * α / 180)) → a
5. IntersectPath(d, a) → c
6. Focus(c) → D, E
7. OrthogonalLine(D, d) → h
8. Intersect(h, f) → G
9. Point(c) → H
10. Line(A, H) → m
11. OrthogonalLine(G, m, space) → f_1
12. OrthogonalLine(E, d) → i
13. Intersect(i, f) → F
14. OrthogonalLine(F, m, space) → t
15. PointIn(a) → C
16. Line(A, C) → g
17. Angle(g, f) → β
18. Sphere(G, D) → b
19. Sphere(F, E) → e
20. OrthogonalPlane(F, u) → l
21. Segment(H, E) → n
22. Segment(H, D) → q
23. OrthogonalPlane(G, u) → o
24. Intersect(t, m) → I
25. Segment(H, I) → j
26. Intersect(f_1, m) → J
27. Segment(J, H) → s
28. Line(A, A + u) → g_1
29. Circle(g_1, I) → c_1
30. Circle(g_1, J) → d_1
31. Plane(c_1) → p
32. Plane(d_1) → r
33. IntersectPath(r, d) → h_1
34. IntersectPath(p, d) → i_1
35. OrthogonalLine(H, h_1, xOyPlane) → j_1
36. Intersect(i_1, j_1) → L
37. Intersect(h_1, j_1) → K
38. Segment(K, H) → k_1
39. Segment(H, L) → l_1