圆锥曲线 by Nadezhda Konstantinova

GeoGebra 命令及参数

1. Point(yAxis) → A
2. Circle(zAxis, A) → c
3. Intersect(xAxis, c, 1) → E
4. Intersect(xAxis, c) → F, G
5. OrthogonalLine(G, xOyPlane) → j
6. Point(j) → J
7. Circle(J, G, E) → k
8. Point(zAxis) → B
9. Circle(B, 2, zAxis) → d
10. Cone(c, 2) → a_1, e, b
11. Cone(d, -2) → f, g, h
12. Point(zAxis) → D
13. Line(D, yAxis) → i
14. Intersect(j, d) → H,
15. PointIn(h) → I
16. Point(k) → K
17. Point(g) → C
18. Plane(K, C, B) → a
19. Rotate(K, 360, (0, 0, 0), xOyPlane) → K'
20. Rotate(K, α, C, xOyPlane) → K'_1
21. Rotate(K, α, C, xOyPlane) → K'_2
22. Line(C, yAxis) → m
23. Point(m) → N
24. Line(N, m) → n
25. Rotate(K, α, m) → K'_3
26. Plane(K'_3, i) → l
27. IntersectPath(l, xOyPlane) → p
28. IntersectPath(l, b) → q
29. IntersectPath(l, b) → r
30. Intersect(yAxis, zAxis) → L
31. Segment(B, L) → s
32. Intersect(s, l) → M
33. OrthogonalLine(M, p, l) → t
34. IntersectPath(l, f) → c_1
35. Corner(c_1) → O, P
36. Line(G, C) → b_1
37. Intersect(b_1, t) → Q
38. Angle(M, Q, C) → γ