平行四边形演示 by Courtney O'Berry

GeoGebra 命令及参数

1. Line(A, B) → f
2. Line(D, f) → g
3. Line(A, D) → h
4. Line(B, h) → i
5. Intersect(g, i) → C
6. Polygon(A, B, C, D) → q1, a, b, d, c
7. Segment(A, C) → j
8. Segment(D, B) → k
9. Intersect(j, k) → E
10. Segment(A, E) → l
11. Segment(E, B) → m
12. Segment(E, C) → n
13. Segment(E, D) → p
14. Angle(A, D, E) → α
15. Angle(D, E, A) → β
16. Angle(A, E, B) → γ
17. Angle(E, B, A) → δ
18. Angle(B, A, E) → ε
19. Angle(E, A, D) → ζ
20. Angle(E, D, C) → η
21. Angle(D, C, E) → θ
22. Angle(E, C, B) → ι
23. Angle(C, B, E) → κ
24. Angle(B, E, C) → λ
25. Angle(C, E, D) → μ