梯形构造演示 by marcgoh09

GeoGebra 命令及参数

1. Line(A, B) → a
2. Line(C, a) → b
3. Point(b) → D
4. Polygon(A, C, D, B) → poly1, a_1, c, d, b_1
5. Segment(A, D) → e
6. Segment(C, B) → f
7. Intersect(e, f) → E
8. Angle(B, C, D) → α
9. Angle(C, B, A) → β
10. Angle(C, D, A) → γ
11. Angle(B, A, D) → δ
12. Angle(E, A, C) → ε
13. Angle(A, C, E) → ζ
14. Angle(B, E, D) → η
15. Distance(A, E) → distanceAE
16. Distance(E, D) → distanceED
17. Distance(C, E) → distanceCE
18. Distance(B, E) → distanceBE
19. Segment(A, B) → g
20. Angle(D, B, C) → θ
21. Angle(A, D, B) → ι
22. Angle(C, E, A) → κ
23. Angle(C, E, D) → λ
24. Angle(B, E, A) → μ
25. Angle(A, C, D) → ν
26. Angle(C, D, B) → ξ
27. Angle(C, A, B) → ο
28. Angle(A, B, D) → ρ
29. Polygon(A, C, D) → poly2, d_1, a_2, c_1
30. Mirror(A, c_1) → A'
31. Mirror(C, c_1) → C'
32. Mirror(D, c_1) → D'
33. Polygon(A', C', D') → poly2', d', a', c'
34. Mirror(A, c') → A'_1
35. Mirror(C, c') → C'_1
36. Mirror(D, c') → D'_1
37. Polygon(C, D, B) → poly3, b_2, c_2, d_2
38. Mirror(C, d_2) → C'_2
39. Mirror(D, d_2) → D'_2
40. Mirror(B, d_2) → B'
41. Polygon(C'_2, D'_2, B') → poly3', b', c'_2, d'_2