平行四边形对角线夹角

GeoGebra 命令及参数

1. Line(A, B) → f
2. Line(B, C) → g
3. Line(C, f) → h
4. Line(A, g) → i
5. Intersect(h, i) → D
6. Segment(A, D) → j
7. Segment(D, C) → k
8. Segment(C, B) → l
9. Segment(B, A) → m
10. Angle(B, A, D) → α
11. Angle(A, D, C) → β
12. Angle(D, C, B) → γ
13. Angle(C, B, A) → δ
14. Segment(A, C) → n
15. Segment(D, B) → p
16. Intersect(n, p) → M
17. Distance(D, M) → distanceDM
18. Distance(M, B) → distanceMB
19. Distance(A, M) → distanceAM
20. Distance(M, C) → distanceMC
21. Angle(C, M, D) → ε
22. Angle(M, D, C) → ζ
23. Angle(A, D, M) → η