三角函数与相似三角形探索

GeoGebra 命令及参数

1. Intersect(b, d) → A
2. Intersect(xAxis, yAxis) → B
3. Segment(B, A) → e
4. Intersect(d, xAxis) → C
5. Segment(C, A) → f
6. Segment(B, C) → g
7. Segment(D, E) → h
8. Segment(F, G) → i
9. Segment(H, I) → j
10. Segment(B, I) → k
11. Segment(J, K) → l
12. Segment(L, M) → m
13. Point(yAxis) → N
14. Point(yAxis) → O
15. OrthogonalLine(O, yAxis) → n
16. OrthogonalLine(N, yAxis) → p
17. Point(n) → P
18. OrthogonalLine(P, n) → q
19. Intersect(p, q) → Q
20. Polygon(O, P, Q, N) → poly1, o, p_1, q_1, n_1
21. Segment(C, H) → r
22. Angle(A, B, C) → α
23. Angle(A, C, B) → β
24. Angle(I, H, B) → γ
25. Segment(H, B) → a_1