平行四边形探索：几何特性与作图方法

GeoGebra 命令及参数

1. Segment(A, B) → a
2. Line(C, a) → b
3. Segment(C, A) → c
4. Line(B, c) → d
5. Intersect(b, d) → D
6. Segment(C, D) → e
7. Segment(B, D) → f
8. Distance(e, c) → g
9. Distance(a, f) → h
10. Midpoint(c) → E
11. Midpoint(e) → F
12. Midpoint(f) → G
13. Midpoint(a) → H
14. Segment(A, B) → i
15. Segment(C, D) → j
16. Segment(A, C) → k
17. Segment(B, D) → l
18. Angle(C, D, B) → α
19. Angle(A, C, D) → β
20. Angle(B, A, C) → γ
21. Angle(D, B, A) → δ
22. Segment(C, B) → p
23. Segment(D, A) → q
24. Intersect(p, q) → I
25. Segment(C, I) → r
26. Segment(I, B) → s
27. Segment(D, I) → t
28. Segment(I, A) → a_1
29. Distance(t, a_1) → u
30. Distance(r, s) → v
31. Midpoint(r) → J
32. Midpoint(s) → K
33. Midpoint(t) → L
34. Midpoint(a_1) → M
35. Segment(A, I) → b_1
36. Segment(I, D) → c_1
37. Segment(C, I) → d_1
38. Segment(I, B) → e_1
39. Segment(A, C) → f_1
40. Segment(B, D) → g_1
41. Segment(A, B) → h_1
42. Segment(C, D) → i_1