平行四边形探究 by Dan Buker

GeoGebra 命令及参数

1. Line(A, B) → a
2. Line(C, a) → b
3. Line(A, C) → c
4. Line(B, c) → d
5. Intersect(b, d) → D
6. Polygon(C, A, B, D) → poly1, c_1, a_1, b_1, d_1
7. Segment(A, D) → AD
8. Segment(C, B) → CB
9. Segment(C, D) → CD
10. Segment(D, B) → DB
11. Segment(B, A) → BA
12. Segment(A, C) → AC
13. Segment(D, A) → g
14. Segment(C, B) → h
15. Angle(g, h) → α
16. Segment(A, D) → j
17. Segment(C, B) → k
18. Angle(B, A, D) → β
19. Angle(D, A, C) → γ
20. Angle(A, C, B) → δ
21. Angle(B, C, D) → ε
22. Angle(C, D, A) → ζ
23. Angle(A, D, B) → η
24. Angle(D, B, C) → θ
25. Angle(C, B, A) → ι
26. Intersect(j, k) → E
27. Segment(E, C) → EC
28. Segment(E, D) → ED
29. Segment(E, B) → EB
30. Segment(E, A) → EA
31. Line(C, A) → n
32. Line(A, B) → p
33. Line(B, D) → q
34. Line(D, C) → r
35. Polygon(F, G, H, I) → poly2, f_1, g_1, h_1, i_1
36. Angle(poly1) → κ, λ, μ, ν