特殊平行四边形的性质

GeoGebra 命令及参数

1. Segment(A, C) → a
2. Midpoint(a) → X
3. OrthogonalLine(X, a) → b
4. Point(b) → B
5. Mirror(B, a) → D
6. Polygon(A, B, C, D) → poly1, a_1, d, b_1, d'
7. Segment(A, X) → c
8. Segment(X, C) → e
9. Segment(B, X) → f
10. Segment(X, D) → g
11. Angle(A, B, C) → α
12. Angle(B, C, D) → β
13. Angle(C, D, A) → γ
14. Angle(D, A, B) → δ
15. Angle(A, X, D) → ε
16. Angle(A, B, X) → ζ
17. Angle(X, B, C) → η
18. Angle(B, C, X) → θ
19. Angle(X, C, D) → ι
20. Angle(C, D, X) → κ
21. Angle(X, D, A) → λ
22. Angle(D, A, X) → μ
23. Angle(X, A, B) → ν