平行四边形性质的支架式探究（脚手架式发现）

GeoGebra 命令及参数

1. Segment(A, B) → a
2. Segment(A, D) → b
3. Line(D, a) → c
4. Line(B, b) → d
5. Intersect(c, d) → C
6. Segment(D, C) → e
7. Segment(B, C) → f
8. Midpoint(A, C) → E
9. Segment(A, E) → g
10. Segment(E, C) → h
11. Segment(D, E) → i
12. Segment(E, B) → j
13. Angle(B, A, E) → α
14. Angle(D, C, E) → β
15. Angle(E, A, D) → γ
16. Angle(C, B, E) → δ
17. Angle(A, D, E) → ε
18. Angle(E, B, A) → ζ
19. Angle(E, D, C) → η
20. Angle(E, C, B) → θ
21. Angle(C, E, D) → ι
22. Polygon(A, B, C) → poly1, c_1, a_1, b_1
23. Mirror(A, g) → A'
24. Mirror(B, g) → B'
25. Mirror(C, g) → C'
26. Polygon(A', B', C') → poly1', c', a', b'
27. Polygon(A, B, D) → poly2, d_1, a_2, b_2
28. Mirror(A, j) → A'_1
29. Mirror(B, j) → B'_1
30. Mirror(D, j) → D'
31. Polygon(A'_1, B'_1, D') → poly2', d', a'_1, b'_1
32. Angle(B, A, D) → κ
33. Angle(A, D, C) → λ
34. Angle(D, C, B) → μ
35. Angle(C, B, A) → ν
36. Polygon(A, B, C, D) → poly3, a_3, b_3, c_2, d_2