平行四边形面积演示 by GreenMaths

GeoGebra 命令及参数

1. Point(xAxis) → Q
2. Point(xAxis) → P
3. Ray(P, Q) → f_1
4. Segment(O, N) → j
5. Point(f_1) → A
6. Line(D, A) → a
7. Point(j) → B
8. Line(B, a) → d
9. Line(A, B) → b
10. Line(D, b) → c
11. Intersect(c, d) → C
12. Polygon(A, B, C, D) → poly1, a_1, b_1, d_1, c_1
13. Point(c_1) → G
14. OrthogonalLine(C, b) → q
15. Intersect(b, q) → M
16. Segment(M, B) → r
17. Translate(C, u) → C'
18. Translate(B, u) → B'
19. Translate(G, u) → G'
20. Translate(D, u) → D'
21. Translate(A, u) → A'
22. Angle(I, B, C) → γ
23. Rotate(C', -θ, I) → C''
24. Rotate(B', -θ, I) → B''
25. Line(B'', C'') → s
26. Rotate(G', -θ, I) → G''
27. Rotate(D', -θ, I) → D''
28. Rotate(A', -θ, I) → A''
29. Line(A'', D'') → l
30. OrthogonalLine(G'', l) → m
31. Intersect(a, b_1) → L
32. Segment(L, D) → p
33. Point(a_1) → E
34. OrthogonalLine(E, c) → e
35. Intersect(c, e) → F
36. Segment(F, E) → h
37. Segment(F, D) → g
38. Segment(C, F) → h_1
39. OrthogonalLine(G, d) → i
40. Intersect(d, i) → H
41. Segment(G, H) → h_2
42. Segment(H, B) → k
43. Angle(G, H, B) → α
44. Angle(B, E, F) → β
45. Polygon(A', B', C', D') → poly1', a', b', c', d'
46. Polygon(A'', B'', C'', D'') → poly1'', a'', b'', c'', d''
47. Intersect(l, m) → K
48. Intersect(m, s) → J
49. Segment(K, J) → n
50. Angle(C'', J, K) → δ
51. Segment(K, A'') → f
52. Segment(A, B) → t
53. Segment(B'', J) → e_1
54. Segment(B, C) → g_1