抛物线反射性质动态演示

GeoGebra 命令及参数

1. Focus(c) → F,
2. Point(c) → C
3. Point(c) → A
4. Point(c) → B
5. Point(c) → D
6. Point(c) → E
7. Point(c) → G
8. Tangent(D, c) → f,
9. Tangent(C, c) → g,
10. Tangent(E, c) → h,
11. Tangent(G, c) → i,
12. Tangent(A, c) → j,
13. Tangent(B, c) → k,
14. Point(f) → I
15. Point(g) → J
16. Point(h) → K
17. Point(k) → L
18. Point(j) → M
19. Point(i) → O
20. Point(j) → P
21. Point(k) → Q
22. Point(f) → R
23. Point(g) → S
24. Point(h) → T
25. Segment(F, E) → m
26. Angle(T, E, F) → α
27. Rotate(K, (-α), E) → K'
28. Angle(K', E, K) → β
29. Segment(E, K') → p
30. Segment(H, D) → l
31. Angle(R, D, H) → γ
32. Rotate(I, (-γ), D) → I'
33. Angle(I', D, I) → δ
34. Segment(D, I') → q
35. Segment(H, C) → r
36. Angle(S, C, H) → ε
37. Rotate(J, (-ε), C) → J'
38. Angle(J', C, J) → ζ
39. Segment(C, J') → s
40. Segment(H, E) → t
41. Angle(T, E, H) → η
42. Rotate(K, (-η), E) → K'_1
43. Angle(K'_1, E, K) → θ
44. Segment(E, K'_1) → a
45. Segment(H, G) → b
46. Angle(H, G, O) → ρ
47. Segment(H, A) → d
48. Angle(H, A, P) → κ
49. Rotate(M, κ, A) → M'
50. Angle(M, A, M') → λ
51. Segment(A, M') → f_1