筝形的面积 by smm

GeoGebra 命令及参数

1. Line(A, yAxis) → a
2. Point(a) → B
3. Segment(C, A) → b
4. Segment(C, B) → c_3
5. Mirror(C, a) → C'
6. Segment(A, C') → d
7. Segment(C', B) → e
8. Segment(A, B) → f
9. Segment(C, C') → g
10. Intersect(f, g) → D
11. Polygon(C, D, B) → poly1, b_1, c_1, d_1
12. Polygon(D, C', B) → poly2, b_2, d_2, c'
13. Polygon(A, D, C') → poly3, c'_1, a_1, d_3
14. Polygon(A, C, D) → poly4, d_4, a_2, c_2
15. Rotate(C, h, B) → C'_1
16. Rotate(D, h, B) → D'
17. Rotate(B, h, B) → B'
18. Mirror(C, c_3) → C'_2
19. Mirror(D, c_3) → D'_1
20. Mirror(B, c_3) → B'_1
21. Midpoint(c_3) → E
22. Midpoint(e) → F
23. OrthogonalLine(E, c_3) → i
24. OrthogonalLine(F, e) → j
25. Intersect(i, j) → G
26. Rotate(C'_2, h, G) → H
27. Rotate(D'_1, h, G) → I
28. Rotate(B'_1, h, G) → J
29. Polygon(H, I, J) → poly1'', j_1, h_1, i_1
30. Angle(B, G, C') → c
31. Mirror(A, b) → A'
32. Mirror(C, b) → C'_3
33. Mirror(D, b) → D'_2
34. Polygon(A', C'_3, D'_2) → poly4', d'_2, a', c'_3
35. Midpoint(b) → K
36. Midpoint(d_3) → L
37. OrthogonalLine(K, b) → k
38. OrthogonalLine(L, d_3) → l
39. Intersect(k, l) → M
40. Angle(A, M, C) → z
41. Rotate(A', (-m), M) → A''
42. Rotate(C'_3, (-m), M) → N
43. Rotate(D'_2, (-m), M) → O
44. Polygon(A'', N, O) → poly4'', o, a'', n
45. Segment(A, C'_3) → p
46. Segment(D, C) → q