平行线与截线形成的角 by Mathguru

GeoGebra 命令及参数

1. Line(A, B) → a
2. Line(C, a) → b
3. Segment(A, C) → c
4. Line(B, c) → d
5. Intersect(b, d) → D
6. Segment(A, B) → e
7. Segment(C, D) → f
8. Point(e) → E
9. Point(e) → F
10. Point(f) → H
11. Point(f) → G
12. Segment(E, F) → g
13. Segment(G, H) → h
14. Point(g) → I
15. Point(h) → J
16. Line(I, J) → i
17. Point(i) → K
18. Point(i) → L
19. Segment(K, L) → j
20. Angle(K, I, B) → α
21. Angle(D, J, L) → δ
22. Angle(L, J, C) → ε
23. Angle(A, I, K) → θ
24. Midpoint(I, J) → M
25. Angle(B, I, M) → β
26. Angle(M, J, D) → γ
27. Angle(C, J, M) → ζ
28. Angle(A, I, M) → η