平行线被截线形成的角

GeoGebra 命令及参数

1. Line(A, B) → a
2. Line(C, a) → b
3. Point(b) → D
4. Line(E, F) → c
5. Intersect(b, c) → G
6. Intersect(a, c) → H
7. Angle(E, G, C) → α
8. Angle(G, H, A) → β
9. Angle(D, G, E) → γ
10. Angle(B, H, G) → δ
11. Angle(A, H, F) → ε
12. Angle(H, G, D) → ζ
13. Angle(C, G, H) → η
14. Angle(F, H, B) → θ
15. Segment(C, D) → d
16. Segment(A, B) → e
17. Segment(E, F) → f
18. Segment(E, F) → g