证明三角形相似

GeoGebra 命令及参数

1. Point(Circle[A, AB]) → B
2. Segment(A, B) → a
3. Rotate(A, (-α), B) → A'
4. Angle(A', B, A) → β
5. Circle(B, BC) → c
6. Ray(B, A') → b
7. Intersect(c, b, 1) → C
8. Segment(B, C) → d
9. Segment(A, C) → e
10. Point(Circle[D, (k * AB)]) → E
11. Segment(D, E) → f
12. Rotate(D, (-α), E) → D'
13. Angle(D', E, D) → γ
14. Ray(E, D') → g
15. Circle(E, (k * BC)) → h
16. Intersect(h, g, 1) → F
17. Segment(E, F) → i
18. Segment(D, F) → j
19. Distance(e, d) → k_1
20. Distance(a, j) → l
21. Distance(i, f) → m
22. Segment(A, C) → p
23. Segment(F, D) → r
24. Angle(A', B, A) → δ
25. Angle(D', E, D) → ε
26. AngularBisector(A, B, C) → s
27. AngularBisector(D, E, F) → f_1
28. Circle(B, 1) → c_1
29. Circle(E, 1) → d_1
30. Intersect(c_1, s, 2) → G
31. Intersect(d_1, f_1, 2) → H
32. Midpoint(A, B) → I
33. Midpoint(B, C) → J
34. Midpoint(D, E) → K
35. Midpoint(E, F) → L
36. Midpoint(D, F) → Q
37. Midpoint(A, C) → R