相似直角三角形与三角比

GeoGebra 命令及参数

1. Segment(A, B) → f
2. OrthogonalLine(B, f) → g
3. Textfield(α) → InputBox1
4. Rotate(B, α, A) → B'
5. Angle(B, A, B') → β
6. Ray(A, B') → h
7. Intersect(g, h) → C
8. Polygon(A, B, C) → t1, c, a, b
9. Segment(B, C) → i
10. Segment(C, A) → j
11. Angle(C, B, A) → γ
12. Segment(D, E) → f_1
13. OrthogonalLine(E, f_1) → g_1
14. Textfield(α) → InputBox1_1
15. Rotate(E, α, D) → B'_1
16. Angle(E, D, B'_1) → β_1
17. Ray(D, B'_1) → h_1
18. Intersect(g_1, h_1) → F
19. Polygon(D, E, F) → t1_1, c_1, a_1, b_1
20. Segment(E, F) → i_1
21. Segment(F, D) → j_1
22. Angle(F, E, D) → γ_1
23. Segment(D, E) → k
24. Segment(E, F) → l
25. Segment(F, D) → m
26. Angle(E, D, F) → δ