相似三角形中的比例

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. Segment(A, B) → t
15. Segment(D, E) → a_1
16. Segment(B, C) → b_1
17. Segment(E, F) → c_1
18. Segment(A, C) → f_1
19. Segment(D, F) → g_1
20. Angle(E, D, F) → ζ