弯折处的角度

GeoGebra 命令及参数

1. Segment(A, C) → c
2. Line(B, c) → d
3. Segment(A, B) → a
4. Line(C, a) → b_2
5. Intersect(b_2, d) → D
6. Polygon(A, B, D, C) → poly1, a_2, b_3, d_1, c_1
7. Segment(C, D) → e
8. PointIn(poly1) → E
9. Segment(B, E) → f
10. Segment(D, E) → g
11. Angle(A, B, E) → β
12. Angle(C, D, E) → γ
13. Line(E, a) → h
14. Line(F_1, h) → i
15. Point(i) → G_1
16. Vector(F_1, G_1) → u
17. Translate(E, u) → G
18. Angle(B, E, G) → δ
19. Angle(D, E, G) → ε
20. Angle(D, E, B) → α
21. Ray(B, E) → t
22. Intersect(b_2, t) → H
23. Angle(E, H, D) → ζ
24. Angle(B, E, D) → η
25. Angle(B, C, D) → θ
26. Vector(G_1, F_1) → v
27. Translate(E, v) → F
28. Vector(E, F) → j
29. Segment(F, G) → a_1
30. Segment(F, E) → b_1
31. Angle(D, E, B) → ι
32. Point(u) → I
33. Point(u) → J
34. Vector(J, I) → b
35. Ray(D, C) → e_1