相似三角形的应用

GeoGebra 命令及参数

1. Polygon(A, B, C) → poly1, c, a, b
2. Point(c) → D
3. Line(D, b) → d
4. Intersect(d, a) → E
5. Segment(D, E) → e
6. Segment(A, C) → f
7. Segment(B, D) → g
8. Segment(B, E) → h
9. Segment(D, A) → i
10. Segment(E, C) → j
11. Angle(E, D, B) → α
12. Angle(C, A, B) → β
13. Midpoint(B, D) → K
14. Midpoint(B, E) → L
15. Midpoint(D, A) → M
16. Midpoint(E, C) → N
17. Midpoint(D, E) → O
18. Midpoint(A, C) → P
19. Angle(E, D, B) → γ
20. Angle(C, A, B) → δ
21. AngularBisector(B, D, E) → q
22. Circle(D, 1) → r
23. Circle(A, 1) → s
24. AngularBisector(B, A, C) → t
25. Intersect(r, q, 2) → Q
26. Intersect(s, t, 2) → R