正弦余弦75度活动

GeoGebra 命令及参数

1. Ray(A, C) → a
2. Ray(A, D) → c
3. Intersect(a, b) → E
4. OrthogonalLine(E, a) → d
5. Point(d) → F
6. Intersect(d, c) → G
7. Line(G, xAxis) → e
8. Intersect(f, yAxis) → H
9. Intersect(e, f) → I
10. Intersect(b, e) → J
11. Segment(G, E) → g
12. Segment(I, G) → h
13. Segment(G, J) → i
14. Segment(J, E) → j
15. Segment(E, B) → k
16. Segment(I, A) → l
17. Segment(A, E) → m
18. Segment(A, G) → n
19. Intersect(b, c) → M
20. Segment(A, B) → q
21. Angle(A, I, G) → ζ
22. Rotate(B, 45*°, A) → B'
23. Angle(B, A, B') → α
24. Ray(A, B') → p
25. Rotate(B', 30*°, A) → B''
26. Angle(B', A, B'') → β
27. Ray(A, B'') → r
28. Intersect(h, r) → K
29. OrthogonalLine(K, m) → s
30. Intersect(s, m) → L
31. OrthogonalLine(L, q) → t
32. Intersect(q, t) → N
33. Intersect(t, h) → O
34. Intersect(t, i) → P
35. Segment(I, K) → a_1
36. Segment(K, P) → b_1
37. Segment(P, L) → c_1
38. Segment(L, N) → d_1
39. Segment(N, A) → e_1
40. Segment(A, K) → f_1
41. Segment(K, L) → g_1
42. Angle(K, L, A) → α_1
43. Angle(I, P, N) → β_1
44. Angle(P, N, A) → γ
45. Segment(A, L) → h_1
46. Angle(P, L, K) → δ
47. Angle(I, K, A) → ε