椭圆-双曲线包络线

GeoGebra 命令及参数

1. Circle(F_1, B) → c
2. Point(c) → F''
3. Segment(F'', F) → a
4. Line(F'', F_1) → b
5. LineBisector(a) → e
6. Intersect(e, b) → P
7. Locus(P, F'') → loc1
8. Segment(F, P) → g
9. Segment(P, F'') → j
10. Point(e) → N
11. Segment(F, N) → h
12. Segment(N, F'') → i
13. Segment(N, F_1) → k
14. If(togT ≟ 1, "Erase Traces", "Show Traces") → Traces
15. If(togA ≟ 1, "Stop Animation", "Start Animation") → Animate
16. Intersect(e, b) → T
17. Textfield(speed) → SPD