平行四边形性质探究

GeoGebra 命令及参数

1. Intersect(xAxis, yAxis) → B
2. Line(B, A) → a
3. Line(A, xAxis) → b
4. Line(B, b) → c
5. Point(c) → C
6. Line(C, a) → d
7. Intersect(b, d) → D
8. Intersect(c, d) → E
9. Polygon(B, A, D, E) → poly1, b_1, a_1, d_1, e
10. Segment(B, D) → f
11. Segment(A, E) → g
12. Intersect(f, g) → F
13. Segment(B, F) → h
14. Segment(F, D) → i
15. Segment(E, F) → j
16. Segment(F, A) → k
17. Angle(E, F, D) → α
18. Angle(D, F, A) → β
19. Angle(A, F, B) → γ
20. Angle(B, F, E) → δ
21. Angle(D, E, B) → ε
22. Angle(B, A, D) → ζ
23. Angle(A, D, E) → η
24. Angle(E, B, A) → θ
25. Angle(E, B, F) → ι
26. Angle(F, B, A) → κ
27. Angle(B, A, F) → λ
28. Angle(F, A, D) → μ
29. Angle(F, E, B) → ν
30. Angle(D, E, F) → ξ
31. Angle(F, D, E) → ο
32. Angle(A, D, F) → ρ
33. Polygon(A, D, E, B) → poly2, a_2, d_2, e_1, b_2
34. Segment(A, E) → p
35. Segment(B, D) → s
36. Segment(A, E) → r
37. Segment(B, D) → c_1