并行线相关角：让你动手完成第6题

GeoGebra 命令及参数

1. Line(A, B) → f_{1}
2. Random(20, 160) → a_{1}
3. Circle(A, 4) → c_{1}
4. Intersect(c_{1}, f_{1}, 2) → C
5. Rotate(C, (a_{1} * π / 180), A) → C'
6. Angle(C, A, C') → α
7. Intersect(c_{1}, f_{1}, 1) → D
8. Angle(C', A, D) → β
9. Mirror(C', A) → C''
10. Ray(A, C'') → h_{1}
11. Angle(D, A, C'') → γ
12. Angle(C'', A, C) → δ
13. Line(A, C') → g_{1}
14. Point(g_{1}) → E
15. Vector(A, E) → u
16. Translate(f_{1}, u) → f'
17. Translate(C, u) → C'_{1}
18. Rotate(C'_{1}, (a_{1} * π / 180), E) → F
19. Rotate(F, π - (a_{1} * π / 180), E) → F'
20. Rotate(F', (a_{1} * π / 180), E) → F''
21. Angle(C'_{1}, E, F) → ε
22. Angle(F, E, F') → ζ
23. Angle(F', E, F'') → η
24. Angle(F'', E, C'_{1}) → θ
25. Random(1, 8) → n
26. Textfield(a) → InputBox1
27. Segment(G, H) → i
28. Segment(I, J) → j
29. Segment(K, L) → k
30. Textfield(b) → InputBox2
31. Textfield(c) → InputBox3
32. Textfield(d) → InputBox4
33. Textfield(e) → InputBox5
34. Textfield(f) → InputBox6
35. Textfield(g) → InputBox7
36. Textfield(h) → InputBox8