霍尔桁架

GeoGebra 命令及参数

1. Rotate(A_2, 120°, B_2) → A'_1
2. Line(B_2, A_2) → f_2
3. Line(B_2, A'_1) → g_2
4. Line(A_2, A'_1) → h_2
5. Segment(A_2, B_2) → i_2
6. Segment(B_2, A'_1) → j_2
7. Segment(A'_1, A_2) → k_2
8. OrthogonalLine(B_2, k_2) → a_2
9. Rotate(A_2, 30°, B_2) → A_1
10. Line(B_2, A_1) → f_1
11. Rotate(A'_1, (-(30°)), B_2) → E_1
12. Line(B_2, E_1) → j_1
13. Midpoint(k_2) → A
14. LineBisector(A_2, A'_1) → f
15. Segment(A, B_2) → g
16. Rotate(A'_1, 30°, A) → B
17. Rotate(A_2, (-(30°)), A) → C
18. Line(A, C) → h
19. Line(A, B) → i
20. Intersect(h, i_2) → D
21. Intersect(i, j_2) → E
22. Segment(A, D) → j
23. Segment(A, E) → k
24. OrthogonalLine(D, k_2) → l
25. OrthogonalLine(E, k_2) → m
26. Intersect(l, k_2) → F
27. Intersect(m, k_2) → I
28. Segment(F, D) → n
29. Segment(I, E) → p
30. Angle(D, F, A_2) → α
31. Angle(A'_1, I, E) → β
32. Angle(D, B_2, A) → γ
33. Angle(A, B_2, E) → δ
34. Angle(A, D, B_2) → ε
35. Angle(B_2, E, A) → ζ
36. Angle(B_2, A, D) → η
37. Angle(E, A, B_2) → θ