平行四边形探索 by Andrew Monjaras-Pierson

GeoGebra 命令及参数

1. Line(A, D) → f
2. Line(A, B) → g
3. Line(D, g) → h
4. Line(B, f) → i
5. Intersect(h, i) → C
6. Polygon(A, B, C, D) → q1, a, b, c, d
7. Angle(D, A, B) → α
8. Angle(A, B, C) → β
9. Angle(C, D, A) → γ
10. Angle(B, C, D) → δ
11. Line(B, D) → j
12. Line(A, C) → k
13. Intersect(j, k) → E
14. Segment(A, E) → l
15. Segment(E, B) → m
16. Segment(E, C) → n
17. Segment(E, D) → p
18. Angle(D, A, E) → ε
19. Angle(E, A, B) → ζ
20. Angle(A, B, E) → η
21. Angle(E, B, C) → θ
22. Angle(B, C, E) → ι
23. Angle(E, C, D) → κ
24. Angle(C, D, E) → λ
25. Angle(E, D, A) → μ
26. Segment(A, C) → q
27. Segment(B, D) → r
28. Segment(A, B) → s
29. Segment(B, C) → t
30. Segment(C, D) → e
31. Segment(D, A) → f_1