平行四边形的对角线关系

GeoGebra 命令及参数

1. Point(yAxis) → A
2. Point(xAxis) → B
3. Line(A, C) → a
4. Line(B, a) → b
5. Line(A, B) → c
6. Line(C, c) → d
7. Intersect(b, d) → D
8. Segment(A, C) → e
9. Segment(B, D) → f
10. Segment(A, B) → g
11. Segment(C, D) → h
12. Slope(a) → m1
13. Slope(b) → m2
14. Line(C, D) → i
15. Slope(i) → m3
16. Line(A, B) → j
17. Slope(j) → m4
18. Segment(C, B) → k
19. Angle(A, B, C) → α
20. Angle(D, C, B) → β
21. Angle(C, B, D) → γ
22. Angle(B, C, A) → δ
23. Angle(C, A, B) → ε
24. Angle(B, D, C) → ζ
25. Angle(D, C, A) → η
26. Angle(A, B, D) → θ
27. Segment(D, A) → l
28. Intersect(k, l) → E
29. Segment(E, A) → m
30. Segment(E, D) → n
31. Segment(E, C) → p
32. Segment(E, B) → q