椭圆参数方程与焦点演示

GeoGebra 命令及参数

1. If(t_1 > t_2, t_1, t_2) → a
2. If(t_1 < t_2, t_1, t_2) → b
3. If(F ≟ A ∨ G ≟ A ∨ H ≟ A ∨ E ≟ A, true, false) → vertexA
4. If(F ≟ B ∨ G ≟ B ∨ H ≟ B ∨ E ≟ B, true, false) → vertexB
5. If(F ≟ C ∨ G ≟ C ∨ H ≟ C ∨ E ≟ C, true, false) → vertexC
6. If(F ≟ D ∨ G ≟ D ∨ H ≟ D ∨ E ≟ D, true, false) → vertexD
7. If(h ≥ 0, "-" + modh, ("+" * modh)) → c_{1}
8. If(k ≥ 0, "-" + modk, "+" + modk) → c_{2}
9. If(t_1 > t_2, (h + c, k), (h, k + c)) → F_{1}
10. If(t_1 > t_2, (h - c, k), (h, k - c)) → F_{2}
11. SurdText(c) → c'
12. Distance(I, F_{1}) → d_{1}
13. Distance(I, F_{2}) → d_{2}
14. Distance(J, F_{1}) → d_{3}
15. Distance(J, F_{2}) → d_{4}