筝形面积

GeoGebra 命令及参数

1. Point(Circle[A, a]) → B
2. Segment(A, B) → b_3
3. Circle(A, B) → c
4. Point(Circle[B, b]) → D
5. Segment(B, D) → f
6. Circle(D, B) → g
7. Intersect(c, g, 1) → C
8. Segment(A, C) → d
9. Segment(C, D) → h
10. Segment(A, D) → d_1
11. Segment(B, C) → d_2
12. Intersect(d_1, d_2) → E_1
13. Polygon(C, E_1, D) → P, d_4, c_1, e_1
14. Polygon(E_1, B, D) → Q, d_3, e_2, b_1
15. Polygon(E_1, C, A) → R, a_1, e_3, c_2
16. Polygon(E_1, B, A) → S, a_2, e_4, b_2
17. Midpoint(C, D) → F
18. Mirror(C, F) → C'
19. Mirror(E_1, F) → E'
20. Mirror(D, F) → D'
21. Midpoint(A, C) → G
22. Midpoint(A, B) → H
23. Midpoint(B, D) → I
24. Mirror(E_1, G) → E'_1
25. Mirror(C, G) → C'_1
26. Mirror(A, G) → A'
27. Mirror(E_1, H) → E'_2
28. Mirror(B, H) → B'
29. Mirror(A, H) → A'_1
30. Mirror(E_1, I) → E'_3
31. Mirror(B, I) → B'_1
32. Mirror(D, I) → D'_1
33. Midpoint(B, C) → E
34. Rotate(E_1, α, G) → E_1'
35. Rotate(C, α, G) → C'_2
36. Rotate(A, α, G) → A'_2
37. Polygon(E_1', C'_2, A'_2) → R', a'_2, e_1', c'_2
38. Rotate(C, (-β), F) → C'_4
39. Rotate(E_1, (-β), F) → E_3
40. Rotate(D, (-β), F) → D'_3
41. Polygon(C'_4, E_3, D'_3) → P', d'_3, c'_4, e_5
42. Rotate(E_1, γ, H) → E_2
43. Rotate(B, γ, H) → B'_2
44. Rotate(A, γ, H) → A'_3
45. Polygon(E_2, B'_2, A'_3) → S', a'_3, e_6, b'_2
46. Rotate(E_1, (-δ), I) → E_4
47. Rotate(B, (-δ), I) → B'_3
48. Rotate(D, (-δ), I) → D'_2
49. Polygon(E_4, B'_3, D'_2) → Q', d'_2, e_7, b'_3