平行四边形作图与性质探索

GeoGebra 命令及参数

1. Segment(A, B) → a
2. Line(C, a) → b
3. Segment(A, C) → c
4. Line(B, c) → d
5. Intersect(b, d) → D
6. Polygon(A, B, D, C) → poly1, a_1, b_1, d_1, c_1
7. Slope(c) → m_2
8. Slope(b) → m_1
9. Line(B, A) → e
10. Slope(e) → m
11. Line(A, C) → f
12. Slope(d) → m_3
13. Angle(B, A, C) → α
14. Angle(C, D, B) → β
15. Angle(A, C, D) → γ
16. Angle(D, B, A) → δ
17. Segment(A, D) → g
18. Segment(B, C) → h
19. Intersect(g, h) → E
20. Segment(B, E) → i
21. Segment(E, C) → j
22. Segment(A, E) → k
23. Segment(E, D) → l
24. Segment(A, D) → n
25. Segment(B, C) → p
26. Intersect(n, p) → F
27. Angle(A, C, F) → ε
28. Angle(C, D, F) → ζ
29. Angle(D, B, F) → η
30. Angle(B, A, F) → θ
31. Angle(F, A, C) → ι
32. Angle(F, C, D) → κ
33. Angle(F, D, B) → λ
34. Angle(F, B, A) → μ
35. Angle(C, F, A) → ν
36. Angle(B, F, D) → ξ
37. Angle(A, F, B) → ο
38. Angle(D, F, C) → ρ