相似三角形中的比例关系

GeoGebra 命令及参数

1. Polygon(A, B, C) → P, c, a, b
2. Angle(P) → α, β, γ
3. Line(B, C) → d
4. Line(E, d) → e
5. Point(e) → F
6. Rotate(F, β, E) → G
7. Angle(F, E, G) → δ
8. Rotate(E, (-γ), F) → F_1
9. Angle(F_1, F, E) → ε
10. Line(E, G) → h
11. Line(F, F_1) → i
12. Intersect(h, i) → D
13. Polygon(D, E, F) → Q, e_1, h_1, d_1
14. Line(H, I) → f
15. OrthogonalLine(H, f) → g
16. OrthogonalLine(I, f) → j
17. Point(g) → J
18. Line(J, f) → k
19. Intersect(j, k) → K
20. Polygon(H, I, K, J) → poly1, h_2, i_1, k_1, j_1
21. Line(L, h_2) → l
22. Point(l) → M
23. OrthogonalLine(L, l) → m
24. OrthogonalLine(M, l) → n
25. Segment(L, M) → p
26. Circle(L, (j_1 * scalerectangle)) → q
27. Intersect(q, m, 2) → N
28. OrthogonalLine(N, m) → r
29. Intersect(n, r) → O
30. Polygon(N, L, M, O) → poly2, n_1, l_1, m_1, o
31. Segment(A, B) → t
32. Segment(D, E) → a_1
33. Segment(B, C) → b_1
34. Segment(E, F) → c_1
35. Segment(A, C) → f_1
36. Segment(D, F) → g_1
37. Segment(J, H) → p_1
38. Segment(N, L) → q_1
39. Segment(H, I) → r_1
40. Segment(L, M) → s_1
41. Angle(E, D, F) → ζ