平行四边形的性质 by Laura Sorrentino

GeoGebra 命令及参数

1. Segment(A, B) → a
2. Line(C, a) → b
3. Segment(B, C) → c
4. Line(A, c) → d
5. Intersect(b, d) → D
6. Segment(A, D) → e
7. Segment(D, C) → f
8. Segment(A_1, B_1) → a_1
9. Line(C_1, a_1) → b_1
10. Segment(B_1, C_1) → c_1
11. Line(A_1, c_1) → d_1
12. Intersect(b_1, d_1) → D_1
13. Segment(A_1, D_1) → e_1
14. Segment(D_1, C_1) → f_1
15. Angle(B_1, A_1, D_1) → α
16. Angle(D_1, C_1, B_1) → β
17. Angle(A_1, B_1, C_1) → γ
18. Angle(C_1, D_1, A_1) → δ
19. Segment(A_2, B_2) → a_2
20. Line(C_2, a_2) → b_2
21. Segment(B_2, C_2) → c_2
22. Line(A_2, c_2) → d_2
23. Intersect(b_2, d_2) → D_2
24. Segment(A_2, D_2) → e_2
25. Segment(D_2, C_2) → f_2
26. Segment(B_2, D_2) → g
27. Segment(A_2, C_2) → h
28. Intersect(g, h) → E
29. Segment(E, B_2) → i
30. Segment(E, D_2) → j
31. Segment(E, C_2) → k
32. Segment(E, A_2) → l