正弦定理的歧义性演示

GeoGebra 命令及参数

1. Ray(A, B) → f
2. Rotate(B, α, A) → B'
3. Angle(B, A, B') → β
4. Ray(A, B') → g
5. Circle(A, 20) → c
6. Intersect(c, g, 1) → C
7. Segment(A, C) → h
8. Circle(C, a) → d
9. Point(d) → D
10. Segment(C, D) → i
11. OrthogonalLine(C, f) → j
12. Intersect(j, f) → D_{min}
13. Segment(C, D_{min}) → k
14. Angle(C, D_{min}, A) → γ
15. Intersect(d, f) → D_1, D_2
16. Segment(A, D_1) → l
17. Angle(C, D_1, A) → δ
18. Segment(A, D_2) → m
19. Angle(C, D_2, A) → ε
20. Angle(A, C, D) → ζ